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 $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 426.00$ 426.00 - $ 426.00Current price $ 426.00
Foster 2803GS, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GS is a Steel 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 $ 426.00$ 426.00 - $ 426.00Current price $ 426.00Save 20% -
Original price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00
Foster 2903GS, 3 Series, Industrial Coupler, Automatic, 1/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 293.00Original price $ 293.00 - Original price $ 293.00Original price $ 293.00Current price $ 236.00$ 236.00 - $ 236.00Current price $ 236.00Save 19% -
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 3103GS, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 404.00Original price $ 404.00 - Original price $ 404.00Original price $ 404.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00
Foster 3203GS, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 404.00Original price $ 404.00 - Original price $ 404.00Original price $ 404.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00Save 20% -
Original price $ 497.00Original price $ 497.00 - Original price $ 497.00Original price $ 497.00Current price $ 397.00$ 397.00 - $ 397.00Current price $ 397.00
Foster 3653GS, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 497.00Original price $ 497.00 - Original price $ 497.00Original price $ 497.00Current price $ 397.00$ 397.00 - $ 397.00Current price $ 397.00Save 20% -
Original price $ 406.00Original price $ 406.00 - Original price $ 406.00Original price $ 406.00Current price $ 326.00$ 326.00 - $ 326.00Current price $ 326.00
Foster 3703GS, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass, 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 $ 326.00$ 326.00 - $ 326.00Current price $ 326.00Save 20% -
Original price $ 504.00Original price $ 504.00 - Original price $ 504.00Original price $ 504.00Current price $ 402.00$ 402.00 - $ 402.00Current price $ 402.00
Foster 3303GB, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 504.00Original price $ 504.00 - Original price $ 504.00Original price $ 504.00Current price $ 402.00$ 402.00 - $ 402.00Current price $ 402.00Save 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 3653GB, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 556.00Original price $ 556.00 - Original price $ 556.00Original price $ 556.00Current price $ 445.00$ 445.00 - $ 445.00Current price $ 445.00
Foster 1513GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb (Push-On), 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 $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00
Foster 1713GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb (Push-On), Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00Save 20% -
Original price $ 38.00Original price $ 38.00 - Original price $ 38.00Original price $ 38.00Current price $ 31.00$ 31.00 - $ 31.00Current price $ 31.00
Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
In stockProtect your 1/4" 3 Series quick plugs when not in use. The Foster 3PDC dust cap keeps dirt, chips, and moisture out of the coupling, helping preve...
View full detailsOriginal price $ 38.00Original price $ 38.00 - Original price $ 38.00Original price $ 38.00Current price $ 31.00$ 31.00 - $ 31.00Current price $ 31.00Save 18% -
Original price $ 217.00Original price $ 217.00 - Original price $ 217.00Original price $ 217.00Current price $ 174.00$ 174.00 - $ 174.00Current price $ 174.00
Foster PD13-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PD13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 217.00Original price $ 217.00 - Original price $ 217.00Original price $ 217.00Current price $ 174.00$ 174.00 - $ 174.00Current price $ 174.00Save 20% -
Original price $ 188.00Original price $ 188.00 - Original price $ 188.00Original price $ 188.00Current price $ 150.00$ 150.00 - $ 150.00Current price $ 150.00
Foster PD11-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PD11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 188.00Original price $ 188.00 - Original price $ 188.00Original price $ 188.00Current price $ 150.00$ 150.00 - $ 150.00Current price $ 150.00Save 20% -
Original price $ 172.00Original price $ 172.00 - Original price $ 172.00Original price $ 172.00Current price $ 138.00$ 138.00 - $ 138.00Current price $ 138.00
Foster PD9-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PD9-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 172.00Original price $ 172.00 - Original price $ 172.00Original price $ 172.00Current price $ 138.00$ 138.00 - $ 138.00Current price $ 138.00Save 20% -
Original price $ 165.00Original price $ 165.00 - Original price $ 165.00Original price $ 165.00Current price $ 133.00$ 133.00 - $ 133.00Current price $ 133.00
Foster PD7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PD7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 165.00Original price $ 165.00 - Original price $ 165.00Original price $ 165.00Current price $ 133.00$ 133.00 - $ 133.00Current price $ 133.00Save 19% -
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 PC7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PC7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
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 $ 347.00Original price $ 347.00 - Original price $ 347.00Original price $ 347.00Current price $ 277.00$ 277.00 - $ 277.00Current price $ 277.00
Foster PC5-3, 1/4" Industrial Plug x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PC5-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 347.00Original price $ 347.00 - Original price $ 347.00Original price $ 347.00Current price $ 277.00$ 277.00 - $ 277.00Current price $ 277.00Save 20% -
Original price $ 461.00Original price $ 461.00 - Original price $ 461.00Original price $ 461.00Current price $ 368.00$ 368.00 - $ 368.00Current price $ 368.00
Foster PB7-3S/S, 1/4" Industrial Plug 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 PB7-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...
View full detailsOriginal price $ 461.00Original price $ 461.00 - Original price $ 461.00Original price $ 461.00Current price $ 368.00$ 368.00 - $ 368.00Current price $ 368.00Save 20% -
Original price $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 200.00$ 200.00 - $ 200.00Current price $ 200.00
Foster PB7-3B, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB7-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 252.00Original price $ 252.00 - Original price $ 252.00Original price $ 252.00Current price $ 200.00$ 200.00 - $ 200.00Current price $ 200.00Save 21% -
Original price $ 147.00Original price $ 147.00 - Original price $ 147.00Original price $ 147.00Current price $ 118.00$ 118.00 - $ 118.00Current price $ 118.00
Foster PB7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 147.00Original price $ 147.00 - Original price $ 147.00Original price $ 147.00Current price $ 118.00$ 118.00 - $ 118.00Current price $ 118.00Save 20% -
Original price $ 308.00Original price $ 308.00 - Original price $ 308.00Original price $ 308.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00
Foster PB5-3B, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB5-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 308.00Original price $ 308.00 - Original price $ 308.00Original price $ 308.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00Save 20% -
Original price $ 161.00Original price $ 161.00 - Original price $ 161.00Original price $ 161.00Current price $ 129.00$ 129.00 - $ 129.00Current price $ 129.00
Foster PB5-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB5-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 161.00Original price $ 161.00 - Original price $ 161.00Original price $ 161.00Current price $ 129.00$ 129.00 - $ 129.00Current price $ 129.00Save 20% -
Original price $ 1,119.00Original price $ 1,119.00 - Original price $ 1,119.00Original price $ 1,119.00Current price $ 895.00$ 895.00 - $ 895.00Current price $ 895.00
Foster PB3-3S/S, 1/4" Industrial Plug 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 PB3-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...
View full detailsOriginal price $ 1,119.00Original price $ 1,119.00 - Original price $ 1,119.00Original price $ 1,119.00Current price $ 895.00$ 895.00 - $ 895.00Current price $ 895.00Save 20% -
Original price $ 243.00Original price $ 243.00 - Original price $ 243.00Original price $ 243.00Current price $ 195.00$ 195.00 - $ 195.00Current price $ 195.00
Foster PB3-3B, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 243.00Original price $ 243.00 - Original price $ 243.00Original price $ 243.00Current price $ 195.00$ 195.00 - $ 195.00Current price $ 195.00Save 20%
