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 $ 224.00Original price $ 224.00 - Original price $ 224.00Original price $ 224.00Current price $ 179.00$ 179.00 - $ 179.00Current price $ 179.00
Foster 12-3S/S, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 224.00Original price $ 224.00 - Original price $ 224.00Original price $ 224.00Current price $ 179.00$ 179.00 - $ 179.00Current price $ 179.00Save 20% -
Original price $ 90.00Original price $ 90.00 - Original price $ 90.00Original price $ 90.00Current price $ 72.00$ 72.00 - $ 72.00Current price $ 72.00
Foster 12-3B, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 90.00Original price $ 90.00 - Original price $ 90.00Original price $ 90.00Current price $ 72.00$ 72.00 - $ 72.00Current price $ 72.00Save 20% -
Original price $ 52.00Original price $ 52.00 - Original price $ 52.00Original price $ 52.00Current price $ 41.00$ 41.00 - $ 41.00Current price $ 41.00
Foster 12-3, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 52.00Original price $ 52.00 - Original price $ 52.00Original price $ 52.00Current price $ 41.00$ 41.00 - $ 41.00Current price $ 41.00Save 21% -
Original price $ 104.00Original price $ 104.00 - Original price $ 104.00Original price $ 104.00Current price $ 82.00$ 82.00 - $ 82.00Current price $ 82.00
Foster 15-3, 1/4" Industrial Plug x 3/8" Female NPT, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 104.00Original price $ 104.00 - Original price $ 104.00Original price $ 104.00Current price $ 82.00$ 82.00 - $ 82.00Current price $ 82.00Save 21% -
Original price $ 204.00Original price $ 204.00 - Original price $ 204.00Original price $ 204.00Current price $ 163.00$ 163.00 - $ 163.00Current price $ 163.00
Foster 11-3S/S, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 204.00Original price $ 204.00 - Original price $ 204.00Original price $ 204.00Current price $ 163.00$ 163.00 - $ 163.00Current price $ 163.00Save 20% -
Original price $ 86.00Original price $ 86.00 - Original price $ 86.00Original price $ 86.00Current price $ 68.00$ 68.00 - $ 68.00Current price $ 68.00
Foster 11-3B, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 86.00Original price $ 86.00 - Original price $ 86.00Original price $ 86.00Current price $ 68.00$ 68.00 - $ 68.00Current price $ 68.00Save 21% -
Original price $ 49.00Original price $ 49.00 - Original price $ 49.00Original price $ 49.00Current price $ 40.00$ 40.00 - $ 40.00Current price $ 40.00
Foster 11-3, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 49.00Original price $ 49.00 - Original price $ 49.00Original price $ 49.00Current price $ 40.00$ 40.00 - $ 40.00Current price $ 40.00Save 18% -
Original price $ 609.00Original price $ 609.00 - Original price $ 609.00Original price $ 609.00Current price $ 488.00$ 488.00 - $ 488.00Current price $ 488.00
Foster 13-3S/S, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 609.00Original price $ 609.00 - Original price $ 609.00Original price $ 609.00Current price $ 488.00$ 488.00 - $ 488.00Current price $ 488.00Save 20% -
Original price $ 100.00Original price $ 100.00 - Original price $ 100.00Original price $ 100.00Current price $ 81.00$ 81.00 - $ 81.00Current price $ 81.00
Foster 13-3B, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 100.00Original price $ 100.00 - Original price $ 100.00Original price $ 100.00Current price $ 81.00$ 81.00 - $ 81.00Current price $ 81.00Save 19% -
Original price $ 59.00Original price $ 59.00 - Original price $ 59.00Original price $ 59.00Current price $ 47.00$ 47.00 - $ 47.00Current price $ 47.00
Foster 13-3, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 59.00Original price $ 59.00 - Original price $ 59.00Original price $ 59.00Current price $ 47.00$ 47.00 - $ 47.00Current price $ 47.00Save 20% -
Original price $ 497.00Original price $ 497.00 - Original price $ 497.00Original price $ 497.00Current price $ 399.00$ 399.00 - $ 399.00Current price $ 399.00
Foster SD11-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 497.00Original price $ 497.00 - Original price $ 497.00Original price $ 497.00Current price $ 399.00$ 399.00 - $ 399.00Current price $ 399.00Save 20% -
Original price $ 650.00Original price $ 650.00 - Original price $ 650.00Original price $ 650.00Current price $ 520.00$ 520.00 - $ 520.00Current price $ 520.00
Foster SD11-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 650.00Original price $ 650.00 - Original price $ 650.00Original price $ 650.00Current price $ 520.00$ 520.00 - $ 520.00Current price $ 520.00Save 20% -
Original price $ 483.00Original price $ 483.00 - Original price $ 483.00Original price $ 483.00Current price $ 386.00$ 386.00 - $ 386.00Current price $ 386.00
Foster SD7-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 483.00Original price $ 483.00 - Original price $ 483.00Original price $ 483.00Current price $ 386.00$ 386.00 - $ 386.00Current price $ 386.00Save 20% -
Original price $ 575.00Original price $ 575.00 - Original price $ 575.00Original price $ 575.00Current price $ 461.00$ 461.00 - $ 461.00Current price $ 461.00
Foster SD7-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 575.00Original price $ 575.00 - Original price $ 575.00Original price $ 575.00Current price $ 461.00$ 461.00 - $ 461.00Current price $ 461.00Save 20% -
Original price $ 479.00Original price $ 479.00 - Original price $ 479.00Original price $ 479.00Current price $ 384.00$ 384.00 - $ 384.00Current price $ 384.00
Foster SB7-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 479.00Original price $ 479.00 - Original price $ 479.00Original price $ 479.00Current price $ 384.00$ 384.00 - $ 384.00Current price $ 384.00Save 20% -
Original price $ 597.00Original price $ 597.00 - Original price $ 597.00Original price $ 597.00Current price $ 479.00$ 479.00 - $ 479.00Current price $ 479.00
Foster SB7-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 597.00Original price $ 597.00 - Original price $ 597.00Original price $ 597.00Current price $ 479.00$ 479.00 - $ 479.00Current price $ 479.00Save 20% -
Original price $ 504.00Original price $ 504.00 - Original price $ 504.00Original price $ 504.00Current price $ 404.00$ 404.00 - $ 404.00Current price $ 404.00
Foster SB5-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 504.00Original price $ 504.00 - Original price $ 504.00Original price $ 504.00Current price $ 404.00$ 404.00 - $ 404.00Current price $ 404.00Save 20% -
Original price $ 650.00Original price $ 650.00 - Original price $ 650.00Original price $ 650.00Current price $ 520.00$ 520.00 - $ 520.00Current price $ 520.00
Foster SB5-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 650.00Original price $ 650.00 - Original price $ 650.00Original price $ 650.00Current price $ 520.00$ 520.00 - $ 520.00Current price $ 520.00Save 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 SB3-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...
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 $ 590.00Original price $ 590.00 - Original price $ 590.00Original price $ 590.00Current price $ 472.00$ 472.00 - $ 472.00Current price $ 472.00
Foster SB3-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
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 $ 520.00Original price $ 520.00 - Original price $ 520.00Original price $ 520.00Current price $ 416.00$ 416.00 - $ 416.00Current price $ 416.00
Foster 1713GB, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 520.00Original price $ 520.00 - Original price $ 520.00Original price $ 520.00Current price $ 416.00$ 416.00 - $ 416.00Current price $ 416.00Save 20% -
Original price $ 556.00Original price $ 556.00 - Original price $ 556.00Original price $ 556.00Current price $ 445.00$ 445.00 - $ 445.00Current price $ 445.00
Foster 1513GB, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 556.00Original price $ 556.00 - Original price $ 556.00Original price $ 556.00Current price $ 445.00$ 445.00 - $ 445.00Current price $ 445.00Save 20% -
Original price $ 406.00Original price $ 406.00 - Original price $ 406.00Original price $ 406.00Current price $ 325.00$ 325.00 - $ 325.00Current price $ 325.00
Foster 3703GS, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 406.00Original price $ 406.00 - Original price $ 406.00Original price $ 406.00Current price $ 325.00$ 325.00 - $ 325.00Current price $ 325.00Save 20% -
Original price $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 424.00$ 424.00 - $ 424.00Current price $ 424.00
Foster 3703GB, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 424.00$ 424.00 - $ 424.00Current price $ 424.00Save 20%
