{"product_id":"foster-41-4-4-series","title":"Foster 41-4, 3\/8\" Industrial Plug x 1\/4\" Female NPT, 4 Series, 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":45468228911151,"sku":"FOST 41-4 (1)","price":3.95,"currency_code":"EUR","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\/products\/foster-41-4-4-series","provider":"hpcouplers","version":"1.0","type":"link"}