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 $ 497.00Original price $ 497.00 - Original price $ 497.00Original price $ 497.00Current price $ 397.00$ 397.00 - $ 397.00Current price $ 397.00
Foster 3653GS, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Slim Profile, 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 $ 508.00Original price $ 508.00 - Original price $ 508.00Original price $ 508.00Current price $ 406.00$ 406.00 - $ 406.00Current price $ 406.00
Foster 3653GB, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Slim Profile, 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 $ 404.00Original price $ 404.00 - Original price $ 404.00Original price $ 404.00Current price $ 324.00$ 324.00 - $ 324.00Current price $ 324.00
Foster 3603GS, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GS 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 $ 515.00Original price $ 515.00 - Original price $ 515.00Original price $ 515.00Current price $ 413.00$ 413.00 - $ 413.00Current price $ 413.00
Foster 3603GB, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 515.00Original price $ 515.00 - Original price $ 515.00Original price $ 515.00Current price $ 413.00$ 413.00 - $ 413.00Current price $ 413.00Save 20% -
Original price $ 399.00Original price $ 399.00 - Original price $ 399.00Original price $ 399.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00
Foster 3303GS, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 399.00Original price $ 399.00 - Original price $ 399.00Original price $ 399.00Current price $ 318.00$ 318.00 - $ 318.00Current price $ 318.00Save 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, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Slim Profile, 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 $ 386.00Original price $ 386.00 - Original price $ 386.00Original price $ 386.00Current price $ 309.00$ 309.00 - $ 309.00Current price $ 309.00
Foster 3103GS, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Slim Profile, 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 $ 477.00Original price $ 477.00 - Original price $ 477.00Original price $ 477.00Current price $ 383.00$ 383.00 - $ 383.00Current price $ 383.00
Foster 3103GB, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 470.00Original price $ 470.00 - Original price $ 470.00Original price $ 470.00Current price $ 377.00$ 377.00 - $ 377.00Current price $ 377.00
Foster 2903GS, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 470.00Original price $ 470.00 - Original price $ 470.00Original price $ 470.00Current price $ 377.00$ 377.00 - $ 377.00Current price $ 377.00Save 20% -
Original price $ 659.00Original price $ 659.00 - Original price $ 659.00Original price $ 659.00Current price $ 527.00$ 527.00 - $ 527.00Current price $ 527.00
Foster 2903GB, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 659.00Original price $ 659.00 - Original price $ 659.00Original price $ 659.00Current price $ 527.00$ 527.00 - $ 527.00Current price $ 527.00Save 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, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Slim Profile, 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 $ 522.00Original price $ 522.00 - Original price $ 522.00Original price $ 522.00Current price $ 418.00$ 418.00 - $ 418.00Current price $ 418.00
Foster 3203GB, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 522.00Original price $ 522.00 - Original price $ 522.00Original price $ 522.00Current price $ 418.00$ 418.00 - $ 418.00Current price $ 418.00Save 20% -
Original price $ 384.00Original price $ 384.00 - Original price $ 384.00Original price $ 384.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00
Foster 3003GS, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Slim Profile, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 384.00Original price $ 384.00 - Original price $ 384.00Original price $ 384.00Current price $ 308.00$ 308.00 - $ 308.00Current price $ 308.00Save 20% -
Original price $ 420.00Original price $ 420.00 - Original price $ 420.00Original price $ 420.00Current price $ 336.00$ 336.00 - $ 336.00Current price $ 336.00
Foster 3003GB, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 420.00Original price $ 420.00 - Original price $ 420.00Original price $ 420.00Current price $ 336.00$ 336.00 - $ 336.00Current price $ 336.00Save 20% -
Original price $ 531.00Original price $ 531.00 - Original price $ 531.00Original price $ 531.00Current price $ 425.00$ 425.00 - $ 425.00Current price $ 425.00
Foster 2803GS, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Slim Profile, 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 $ 425.00$ 425.00 - $ 425.00Current price $ 425.00Save 20% -
Original price $ 459.00Original price $ 459.00 - Original price $ 459.00Original price $ 459.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00
Foster 2803GB, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Slim Profile, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 459.00Original price $ 459.00 - Original price $ 459.00Original price $ 459.00Current price $ 366.00$ 366.00 - $ 366.00Current price $ 366.00Save 20% -
Original price $ 616.00Original price $ 616.00 - Original price $ 616.00Original price $ 616.00Current price $ 493.00$ 493.00 - $ 493.00Current price $ 493.00
Foster SLSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD13-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 616.00Original price $ 616.00 - Original price $ 616.00Original price $ 616.00Current price $ 493.00$ 493.00 - $ 493.00Current price $ 493.00Save 20% -
Original price $ 586.00Original price $ 586.00 - Original price $ 586.00Original price $ 586.00Current price $ 468.00$ 468.00 - $ 468.00Current price $ 468.00
Foster SLSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD11-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 586.00Original price $ 586.00 - Original price $ 586.00Original price $ 586.00Current price $ 468.00$ 468.00 - $ 468.00Current price $ 468.00Save 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 SLSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD9-3 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 $ 568.00Original price $ 568.00 - Original price $ 568.00Original price $ 568.00Current price $ 454.00$ 454.00 - $ 454.00Current price $ 454.00
Foster SLSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSD7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 568.00Original price $ 568.00 - Original price $ 568.00Original price $ 568.00Current price $ 454.00$ 454.00 - $ 454.00Current price $ 454.00Save 20% -
Original price $ 783.00Original price $ 783.00 - Original price $ 783.00Original price $ 783.00Current price $ 627.00$ 627.00 - $ 627.00Current price $ 627.00
Foster SLSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSC7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 783.00Original price $ 783.00 - Original price $ 783.00Original price $ 783.00Current price $ 627.00$ 627.00 - $ 627.00Current price $ 627.00Save 20% -
Original price $ 783.00Original price $ 783.00 - Original price $ 783.00Original price $ 783.00Current price $ 627.00$ 627.00 - $ 627.00Current price $ 627.00
Foster SLSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSC5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 783.00Original price $ 783.00 - Original price $ 783.00Original price $ 783.00Current price $ 627.00$ 627.00 - $ 627.00Current price $ 627.00Save 20% -
Original price $ 593.00Original price $ 593.00 - Original price $ 593.00Original price $ 593.00Current price $ 475.00$ 475.00 - $ 475.00Current price $ 475.00
Foster SLSB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 593.00Original price $ 593.00 - Original price $ 593.00Original price $ 593.00Current price $ 475.00$ 475.00 - $ 475.00Current price $ 475.00Save 20% -
Original price $ 534.00Original price $ 534.00 - Original price $ 534.00Original price $ 534.00Current price $ 429.00$ 429.00 - $ 429.00Current price $ 429.00
Foster SLSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 534.00Original price $ 534.00 - Original price $ 534.00Original price $ 534.00Current price $ 429.00$ 429.00 - $ 429.00Current price $ 429.00Save 20%
