{"title":"Foster 4 Series Couplers","description":"\u003cp\u003eThe Foster 4 Series is the 3\/8\" body industrial interchange, one of the most common air coupler sizes for shop and industrial use. This collection includes 4 Series couplers and plugs in brass, steel, and stainless with NPT, hose barb, push-on, and reusable terminations. Filter by thread, material, and coupler or plug to match your line.\u003c\/p\u003e","products":[{"product_id":"4-series-industrial-plug-1-4-male-npt-steel","title":"Foster 40-4, 4 Series, Industrial Plug, 1\/4\" Male NPT, Steel","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e40-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 40-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 1\/4\" Male NPT, MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this plug with a matching 3\/8\" 4 Series coupler for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7146185097263,"sku":"40-4 (1)","price":4.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/40-4_1pcHPC.jpg?v=1530128884"},{"product_id":"4-series-industrial-plug-1-4-female-npt-steel","title":"Foster 41-4, 4 Series, Industrial Plug, 1\/4\" Female NPT, Steel","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e41-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 41-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 1\/4\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this plug with a matching 3\/8\" 4 Series coupler for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7146257317935,"sku":"41-4 (1)","price":4.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/41-4_1pcHPC.jpg?v=1530133623"},{"product_id":"4-series-industrial-plug-3-8-male-npt-brass","title":"Foster 42-4B, 4 Series, Industrial Plug, 3\/8\" Male NPT, Brass","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e42-4B\u003c\/strong\u003e is a Brass 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 42-4B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Male NPT, MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this plug with a matching 3\/8\" 4 Series coupler for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7146351034415,"sku":"42-4B (1)","price":7.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/42-4B_1pcHPC_1ce3a24c-6a9c-40cf-a586-52fdc9f2416b.jpg?v=1529608711"},{"product_id":"4-series-industrial-plug-3-8-female-npt-steel","title":"Foster 43-4, 4 Series, Industrial Plug, 3\/8\" Female NPT, Steel","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e43-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 43-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this plug with a matching 3\/8\" 4 Series coupler for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7146353983535,"sku":"43-4 (1)","price":5.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/43-4_1pcHPC.jpg?v=1530038860"},{"product_id":"4-series-industrial-plug-1-2-male-npt-steel","title":"Foster 44-4, 4 Series, Industrial Plug, 1\/2\" Male NPT, Steel","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e44-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e45-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 45-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 1\/2\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e48-4\u003c\/strong\u003e is a Steel 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e48-4B\u003c\/strong\u003e is a Brass 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7192046469167,"sku":"FM4304 (1)","price":25.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/FM4304_1pcHPC.jpg?v=1525459383"},{"product_id":"4-series-industrial-coupler-automatic-1-2-female-npt-brass","title":"Foster FM4404, 4 Series, Industrial Coupler, Automatic, 1\/2\" Female NPT, Brass","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003eFM4404\u003c\/strong\u003e is a Brass 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7192065179695,"sku":"FM4404 (1)","price":26.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/FM4404_1pcHPC.jpg?v=1529443077"},{"product_id":"4-series-industrial-coupler-automatic-1-2-male-npt-brass","title":"Foster FM4504, 4 Series, Industrial Coupler, Automatic, 1\/2\" Male NPT, Brass","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003eFM4504\u003c\/strong\u003e is a Brass 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":7192733417519,"sku":"FM4904 (1)","price":26.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/products\/FM4904_1pcHPC.jpg?v=1529439646"},{"product_id":"foster-40-4b-4-series-industrial-plug-1-4-male-npt-brass","title":"Foster 40-4B, 4 Series, Industrial Plug, 1\/4\" Male NPT, Brass","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. 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Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 40-4B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 1\/4\" Male NPT, MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e4404\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 4404\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 1\/2\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\/Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Manual pull sleeve to connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this coupler\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual pull sleeve\u003c\/strong\u003e — which means a positive, deliberate connection; retract the sleeve by hand to connect or release the plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass body with steel sleeve\u003c\/strong\u003e — which means corrosion resistance where it contacts media plus a hardened, long-wearing sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this plug with a matching 3\/8\" 4 Series coupler for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":42006218407983,"sku":"FOST 49-4 (1)","price":5.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/46-4_1pcHPC_d2110071-f4dc-4968-a5ff-690e3c05b4f2.jpg?v=1704963026"},{"product_id":"foster-4304-4-series-industrial-coupler-manual-3-8-male-npt-brass-steel","title":"Foster 4304, 4 Series, Industrial Coupler, Manual, 3\/8\" Male NPT, Brass, Steel","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. 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Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 4304\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Male NPT, MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\/Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Manual pull sleeve to connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this coupler\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual pull sleeve\u003c\/strong\u003e — which means a positive, deliberate connection; retract the sleeve by hand to connect or release the plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass body with steel sleeve\u003c\/strong\u003e — which means corrosion resistance where it contacts media plus a hardened, long-wearing sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003eFM4304\u003c\/strong\u003e is a Brass 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e FM4304\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Male NPT, MPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Automatic, push-to-connect (insert the plug; no sleeve retraction to connect)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this coupler\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic push-to-connect\u003c\/strong\u003e — which means you connect with a single-handed push, no sleeve retraction; faster cycle times on the line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e — which means corrosion resistance and smooth, reliable operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003eFM4604\u003c\/strong\u003e is a Brass 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 47-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 5\/16\" Hose ID\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e71-4B\u003c\/strong\u003e is a Brass 3\/8\" industrial plug from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 71-4B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Push-On Hose Stem\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e One-Way Shut-Off plug (un-valved; mates with valved socket)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this plug\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e — which means it withstands repeated high-pressure cycling without deforming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange coupler (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e1714\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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The Foster \u003cstrong\u003e1814\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this push-to-connect?\u003c\/strong\u003e\u003cbr\u003eYes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. \u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003eBL4004\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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The Foster \u003cstrong\u003e4204\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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The Foster \u003cstrong\u003e4204H\u003c\/strong\u003e is a Brass\/Steel 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Viton seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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The Foster \u003cstrong\u003e4204S\u003c\/strong\u003e is a Brass body, Brass sleeve, SS valve 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Ethylene Propylene (EPDM) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. 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Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":45468204630063,"sku":"FOST 4204S\/S (1)","price":39.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Foster_Stock_Image_v1.png?v=1781220743"},{"product_id":"foster-bl4204s-s-4-series","title":"Foster BL4204S\/S, 3\/8\" Industrial Coupler x 3\/8\" Female NPT, 4 Series, Ball Lock, 303 Stainless","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003eBL4204S\/S\u003c\/strong\u003e is a 303 Stainless 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e BL4204S\/S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 303 Stainless\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Manual pull sleeve to connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this coupler\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual pull sleeve\u003c\/strong\u003e — which means a positive, deliberate connection; retract the sleeve by hand to connect or release the plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e303 stainless construction\u003c\/strong\u003e — which means superior corrosion resistance for washdown, marine, and chemical environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Lock (BL)\u003c\/strong\u003e — which means the sleeve rotates to lock after connection, guarding against accidental disconnect.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":45468204826671,"sku":"FOST BL4204S\/S (1)","price":41.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Foster_Stock_Image_v1.png?v=1781220743"},{"product_id":"foster-4204w-4-series","title":"Foster 4204W, 3\/8\" Industrial Coupler x 3\/8\" Female NPT, 4 Series, Water, Brass\/SS","description":"\u003cp\u003eReliable, leak-free 3\/8\" connections for air and fluid lines. The Foster \u003cstrong\u003e4204W\u003c\/strong\u003e is a Brass\/SS 3\/8\" industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3\/8\"-body industrial-interchange half (ISO 6150-B \/ ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect\/disconnect.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Foster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 4204W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchange:\u003c\/strong\u003e 3\/8\" Industrial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e 3\/8\" Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\" Female NPT, FPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e One-Way Shut-Off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\/SS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Manual pull sleeve to connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorking Pressure:\u003c\/strong\u003e 300 PSIG; vacuum to 27\" Hg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e +32°F to +100°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Buna-N (Nitrile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1pc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy this coupler\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual pull sleeve\u003c\/strong\u003e — which means a positive, deliberate connection; retract the sleeve by hand to connect or release the plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e — which means corrosion resistance and smooth, reliable operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Shut-Off\u003c\/strong\u003e — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSnap it on and the connection just holds — full 3\/8\" flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does this connect to?\u003c\/strong\u003e\u003cbr\u003eIt mates with any 3\/8\"-body industrial-interchange plug (ISO 6150-B \/ ANSI T3.20.14) — the most common air-coupler standard in North America.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pressure and temperature is it rated for?\u003c\/strong\u003e\u003cbr\u003e300 PSIG working pressure (vacuum to 27\" Hg connected), with a Buna-N (Nitrile) seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this air coupler fuel-rated?\u003c\/strong\u003e\u003cbr\u003eNo — the 4 Series is an industrial air\/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.\u003c\/p\u003e\u003cp\u003eIdeal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3\/8\" 4 Series plug for a complete, leak-free connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy from hpcouplers:\u003c\/strong\u003e Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.\u003c\/p\u003e","brand":"Foster","offers":[{"title":"Default Title","offer_id":45468205154351,"sku":"FOST 4204W (1)","price":23.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Foster_Stock_Image_v1.png?v=1781220743"}],"url":"https:\/\/www.hpcouplers.com\/en-ie\/collections\/foster-4-series-couplers.oembed?page=3","provider":"hpcouplers","version":"1.0","type":"link"}