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 $ 12.49Original price $ 12.49 - Original price $ 12.49Original price $ 12.49Current price $ 9.99$ 9.99 - $ 9.99Current price $ 9.99
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 $ 12.49Original price $ 12.49 - Original price $ 12.49Original price $ 12.49Current price $ 9.99$ 9.99 - $ 9.99Current price $ 9.99Save 20% -
Original price $ 4.99Original price $ 4.99 - Original price $ 4.99Original price $ 4.99Current price $ 3.99$ 3.99 - $ 3.99Current price $ 3.99
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 $ 4.99Original price $ 4.99 - Original price $ 4.99Original price $ 4.99Current price $ 3.99$ 3.99 - $ 3.99Current price $ 3.99Save 20% -
Original price $ 2.89Original price $ 2.89 - Original price $ 2.89Original price $ 2.89Current price $ 2.29$ 2.29 - $ 2.29Current price $ 2.29
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 $ 2.89Original price $ 2.89 - Original price $ 2.89Original price $ 2.89Current price $ 2.29$ 2.29 - $ 2.29Current price $ 2.29Save 21% -
Original price $ 5.79Original price $ 5.79 - Original price $ 5.79Original price $ 5.79Current price $ 4.59$ 4.59 - $ 4.59Current price $ 4.59
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 $ 5.79Original price $ 5.79 - Original price $ 5.79Original price $ 5.79Current price $ 4.59$ 4.59 - $ 4.59Current price $ 4.59Save 21% -
Original price $ 11.39Original price $ 11.39 - Original price $ 11.39Original price $ 11.39Current price $ 9.09$ 9.09 - $ 9.09Current price $ 9.09
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 $ 11.39Original price $ 11.39 - Original price $ 11.39Original price $ 11.39Current price $ 9.09$ 9.09 - $ 9.09Current price $ 9.09Save 20% -
Original price $ 4.79Original price $ 4.79 - Original price $ 4.79Original price $ 4.79Current price $ 3.79$ 3.79 - $ 3.79Current price $ 3.79
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 $ 4.79Original price $ 4.79 - Original price $ 4.79Original price $ 4.79Current price $ 3.79$ 3.79 - $ 3.79Current price $ 3.79Save 21% -
Original price $ 2.69Original price $ 2.69 - Original price $ 2.69Original price $ 2.69Current price $ 2.19$ 2.19 - $ 2.19Current price $ 2.19
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 $ 2.69Original price $ 2.69 - Original price $ 2.69Original price $ 2.69Current price $ 2.19$ 2.19 - $ 2.19Current price $ 2.19Save 19% -
Original price $ 34.09Original price $ 34.09 - Original price $ 34.09Original price $ 34.09Current price $ 27.29$ 27.29 - $ 27.29Current price $ 27.29
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 $ 34.09Original price $ 34.09 - Original price $ 34.09Original price $ 34.09Current price $ 27.29$ 27.29 - $ 27.29Current price $ 27.29Save 20% -
Original price $ 5.59Original price $ 5.59 - Original price $ 5.59Original price $ 5.59Current price $ 4.49$ 4.49 - $ 4.49Current price $ 4.49
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 $ 5.59Original price $ 5.59 - Original price $ 5.59Original price $ 5.59Current price $ 4.49$ 4.49 - $ 4.49Current price $ 4.49Save 20% -
Original price $ 3.29Original price $ 3.29 - Original price $ 3.29Original price $ 3.29Current price $ 2.59$ 2.59 - $ 2.59Current price $ 2.59
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 $ 3.29Original price $ 3.29 - Original price $ 3.29Original price $ 3.29Current price $ 2.59$ 2.59 - $ 2.59Current price $ 2.59Save 21% -
Original price $ 27.79Original price $ 27.79 - Original price $ 27.79Original price $ 27.79Current price $ 22.29$ 22.29 - $ 22.29Current price $ 22.29
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 $ 27.79Original price $ 27.79 - Original price $ 27.79Original price $ 27.79Current price $ 22.29$ 22.29 - $ 22.29Current price $ 22.29Save 20% -
Original price $ 36.39Original price $ 36.39 - Original price $ 36.39Original price $ 36.39Current price $ 29.09$ 29.09 - $ 29.09Current price $ 29.09
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 $ 36.39Original price $ 36.39 - Original price $ 36.39Original price $ 36.39Current price $ 29.09$ 29.09 - $ 29.09Current price $ 29.09Save 20% -
Original price $ 26.99Original price $ 26.99 - Original price $ 26.99Original price $ 26.99Current price $ 21.59$ 21.59 - $ 21.59Current price $ 21.59
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 $ 26.99Original price $ 26.99 - Original price $ 26.99Original price $ 26.99Current price $ 21.59$ 21.59 - $ 21.59Current price $ 21.59Save 20% -
Original price $ 32.19Original price $ 32.19 - Original price $ 32.19Original price $ 32.19Current price $ 25.79$ 25.79 - $ 25.79Current price $ 25.79
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 $ 32.19Original price $ 32.19 - Original price $ 32.19Original price $ 32.19Current price $ 25.79$ 25.79 - $ 25.79Current price $ 25.79Save 20% -
Original price $ 26.79Original price $ 26.79 - Original price $ 26.79Original price $ 26.79Current price $ 21.49$ 21.49 - $ 21.49Current price $ 21.49
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 $ 26.79Original price $ 26.79 - Original price $ 26.79Original price $ 26.79Current price $ 21.49$ 21.49 - $ 21.49Current price $ 21.49Save 20% -
Original price $ 33.39Original price $ 33.39 - Original price $ 33.39Original price $ 33.39Current price $ 26.79$ 26.79 - $ 26.79Current price $ 26.79
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 $ 33.39Original price $ 33.39 - Original price $ 33.39Original price $ 33.39Current price $ 26.79$ 26.79 - $ 26.79Current price $ 26.79Save 20% -
Original price $ 28.19Original price $ 28.19 - Original price $ 28.19Original price $ 28.19Current price $ 22.59$ 22.59 - $ 22.59Current price $ 22.59
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 $ 28.19Original price $ 28.19 - Original price $ 28.19Original price $ 28.19Current price $ 22.59$ 22.59 - $ 22.59Current price $ 22.59Save 20% -
Original price $ 36.39Original price $ 36.39 - Original price $ 36.39Original price $ 36.39Current price $ 29.09$ 29.09 - $ 29.09Current price $ 29.09
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 $ 36.39Original price $ 36.39 - Original price $ 36.39Original price $ 36.39Current price $ 29.09$ 29.09 - $ 29.09Current price $ 29.09Save 20% -
Original price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99
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 $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99Save 20% -
Original price $ 32.99Original price $ 32.99 - Original price $ 32.99Original price $ 32.99Current price $ 26.39$ 26.39 - $ 26.39Current price $ 26.39
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 $ 32.99Original price $ 32.99 - Original price $ 32.99Original price $ 32.99Current price $ 26.39$ 26.39 - $ 26.39Current price $ 26.39Save 20% -
Original price $ 29.09Original price $ 29.09 - Original price $ 29.09Original price $ 29.09Current price $ 23.29$ 23.29 - $ 23.29Current price $ 23.29
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 $ 29.09Original price $ 29.09 - Original price $ 29.09Original price $ 29.09Current price $ 23.29$ 23.29 - $ 23.29Current price $ 23.29Save 20% -
Original price $ 31.09Original price $ 31.09 - Original price $ 31.09Original price $ 31.09Current price $ 24.89$ 24.89 - $ 24.89Current price $ 24.89
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 $ 31.09Original price $ 31.09 - Original price $ 31.09Original price $ 31.09Current price $ 24.89$ 24.89 - $ 24.89Current price $ 24.89Save 20% -
Original price $ 22.69Original price $ 22.69 - Original price $ 22.69Original price $ 22.69Current price $ 18.19$ 18.19 - $ 18.19Current price $ 18.19
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 $ 22.69Original price $ 22.69 - Original price $ 22.69Original price $ 22.69Current price $ 18.19$ 18.19 - $ 18.19Current price $ 18.19Save 20% -
Original price $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.69$ 23.69 - $ 23.69Current price $ 23.69
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 $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.69$ 23.69 - $ 23.69Current price $ 23.69Save 20%
