Foster 3 Series Couplers
The Foster 3 Series is the 1/4" body industrial interchange, the most popular air coupler size for shop and industrial systems. This collection includes 3 Series couplers and plugs in brass, steel, and stainless with NPT, hose barb, push-on, and reusable terminations, plus automatic, sleeve guard, ball check, and dust cap options. Filter by thread, material, and coupler or plug to match your line.
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Original price $ 386.00Original price $ 386.00 - Original price $ 386.00Original price $ 386.00Current price $ 309.00$ 309.00 - $ 309.00Current price $ 309.00
Foster BLSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 386.00Original price $ 386.00 - Original price $ 386.00Original price $ 386.00Current price $ 309.00$ 309.00 - $ 309.00Current price $ 309.00Save 20% -
Original price $ 363.00Original price $ 363.00 - Original price $ 363.00Original price $ 363.00Current price $ 290.00$ 290.00 - $ 290.00Current price $ 290.00
Foster SD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 363.00Original price $ 363.00 - Original price $ 363.00Original price $ 363.00Current price $ 290.00$ 290.00 - $ 290.00Current price $ 290.00Save 20% -
Original price $ 588.00Original price $ 588.00 - Original price $ 588.00Original price $ 588.00Current price $ 470.00$ 470.00 - $ 470.00Current price $ 470.00
Foster BLSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 588.00Original price $ 588.00 - Original price $ 588.00Original price $ 588.00Current price $ 470.00$ 470.00 - $ 470.00Current price $ 470.00Save 20% -
Original price $ 590.00Original price $ 590.00 - Original price $ 590.00Original price $ 590.00Current price $ 472.00$ 472.00 - $ 472.00Current price $ 472.00
Foster SC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 590.00Original price $ 590.00 - Original price $ 590.00Original price $ 590.00Current price $ 472.00$ 472.00 - $ 472.00Current price $ 472.00Save 20% -
Original price $ 581.00Original price $ 581.00 - Original price $ 581.00Original price $ 581.00Current price $ 465.00$ 465.00 - $ 465.00Current price $ 465.00
Foster BLSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 581.00Original price $ 581.00 - Original price $ 581.00Original price $ 581.00Current price $ 465.00$ 465.00 - $ 465.00Current price $ 465.00Save 20% -
Original price $ 583.00Original price $ 583.00 - Original price $ 583.00Original price $ 583.00Current price $ 466.00$ 466.00 - $ 466.00Current price $ 466.00
Foster SC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 583.00Original price $ 583.00 - Original price $ 583.00Original price $ 583.00Current price $ 466.00$ 466.00 - $ 466.00Current price $ 466.00Save 20% -
Original price $ 477.00Original price $ 477.00 - Original price $ 477.00Original price $ 477.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
Foster BLSB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 477.00Original price $ 477.00 - Original price $ 477.00Original price $ 477.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00Save 20% -
Original price $ 411.00Original price $ 411.00 - Original price $ 411.00Original price $ 411.00Current price $ 329.00$ 329.00 - $ 329.00Current price $ 329.00
Foster SB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 411.00Original price $ 411.00 - Original price $ 411.00Original price $ 411.00Current price $ 329.00$ 329.00 - $ 329.00Current price $ 329.00Save 20% -
Original price $ 1,204.00Original price $ 1,204.00 - Original price $ 1,204.00Original price $ 1,204.00Current price $ 963.00$ 963.00 - $ 963.00Current price $ 963.00
Foster BLSB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Se...
View full detailsOriginal price $ 1,204.00Original price $ 1,204.00 - Original price $ 1,204.00Original price $ 1,204.00Current price $ 963.00$ 963.00 - $ 963.00Current price $ 963.00Save 20% -
Original price $ 1,134.00Original price $ 1,134.00 - Original price $ 1,134.00Original price $ 1,134.00Current price $ 908.00$ 908.00 - $ 908.00Current price $ 908.00
Foster SB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 1,134.00Original price $ 1,134.00 - Original price $ 1,134.00Original price $ 1,134.00Current price $ 908.00$ 908.00 - $ 908.00Current price $ 908.00Save 20% -
Original price $ 377.00Original price $ 377.00 - Original price $ 377.00Original price $ 377.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00
Foster BLSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 377.00Original price $ 377.00 - Original price $ 377.00Original price $ 377.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00Save 20% -
Original price $ 349.00Original price $ 349.00 - Original price $ 349.00Original price $ 349.00Current price $ 279.00$ 279.00 - $ 279.00Current price $ 279.00
Foster SB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 349.00Original price $ 349.00 - Original price $ 349.00Original price $ 349.00Current price $ 279.00$ 279.00 - $ 279.00Current price $ 279.00Save 20% -
Original price $ 508.00Original price $ 508.00 - Original price $ 508.00Original price $ 508.00Current price $ 406.00$ 406.00 - $ 406.00Current price $ 406.00
Foster BLSB5-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 508.00Original price $ 508.00 - Original price $ 508.00Original price $ 508.00Current price $ 406.00$ 406.00 - $ 406.00Current price $ 406.00Save 20% -
Original price $ 395.00Original price $ 395.00 - Original price $ 395.00Original price $ 395.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00
Foster BLSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 395.00Original price $ 395.00 - Original price $ 395.00Original price $ 395.00Current price $ 315.00$ 315.00 - $ 315.00Current price $ 315.00Save 20% -
Original price $ 377.00Original price $ 377.00 - Original price $ 377.00Original price $ 377.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00
Foster SB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 377.00Original price $ 377.00 - Original price $ 377.00Original price $ 377.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00Save 20% -
Original price $ 424.00Original price $ 424.00 - Original price $ 424.00Original price $ 424.00Current price $ 340.00$ 340.00 - $ 340.00Current price $ 340.00
Foster SB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 424.00Original price $ 424.00 - Original price $ 424.00Original price $ 424.00Current price $ 340.00$ 340.00 - $ 340.00Current price $ 340.00Save 20% -
Original price $ 1,961.00Original price $ 1,961.00 - Original price $ 1,961.00Original price $ 1,961.00Current price $ 1,570.00$ 1,570.00 - $ 1,570.00Current price $ 1,570.00
Foster SB3-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 1,961.00Original price $ 1,961.00 - Original price $ 1,961.00Original price $ 1,961.00Current price $ 1,570.00$ 1,570.00 - $ 1,570.00Current price $ 1,570.00Save 20% -
Original price $ 470.00Original price $ 470.00 - Original price $ 470.00Original price $ 470.00Current price $ 375.00$ 375.00 - $ 375.00Current price $ 375.00
Foster BLSB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 470.00Original price $ 470.00 - Original price $ 470.00Original price $ 470.00Current price $ 375.00$ 375.00 - $ 375.00Current price $ 375.00Save 20% -
Original price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 284.00$ 284.00 - $ 284.00Current price $ 284.00
Foster SB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 284.00$ 284.00 - $ 284.00Current price $ 284.00Save 20% -
Original price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 283.00$ 283.00 - $ 283.00Current price $ 283.00
Foster 3703W, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 354.00Original price $ 354.00 - Original price $ 354.00Original price $ 354.00Current price $ 283.00$ 283.00 - $ 283.00Current price $ 283.00Save 20% -
Original price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00
Foster BL3703S/S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 1,292.00Original price $ 1,292.00 - Original price $ 1,292.00Original price $ 1,292.00Current price $ 1,033.00$ 1,033.00 - $ 1,033.00Current price $ 1,033.00Save 20% -
Original price $ 1,229.00Original price $ 1,229.00 - Original price $ 1,229.00Original price $ 1,229.00Current price $ 984.00$ 984.00 - $ 984.00Current price $ 984.00
Foster 3703S/S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 1,229.00Original price $ 1,229.00 - Original price $ 1,229.00Original price $ 1,229.00Current price $ 984.00$ 984.00 - $ 984.00Current price $ 984.00Save 20% -
Original price $ 350.00Original price $ 350.00 - Original price $ 350.00Original price $ 350.00Current price $ 281.00$ 281.00 - $ 281.00Current price $ 281.00
Foster 3703S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 350.00Original price $ 350.00 - Original price $ 350.00Original price $ 350.00Current price $ 281.00$ 281.00 - $ 281.00Current price $ 281.00Save 20% -
Original price $ 316.00Original price $ 316.00 - Original price $ 316.00Original price $ 316.00Current price $ 254.00$ 254.00 - $ 254.00Current price $ 254.00
Foster BL3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 316.00Original price $ 316.00 - Original price $ 316.00Original price $ 316.00Current price $ 254.00$ 254.00 - $ 254.00Current price $ 254.00Save 20%
