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 $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.79$ 23.79 - $ 23.79Current price $ 23.79
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 $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.79$ 23.79 - $ 23.79Current price $ 23.79Save 20% -
Original price $ 16.39Original price $ 16.39 - Original price $ 16.39Original price $ 16.39Current price $ 13.19$ 13.19 - $ 13.19Current price $ 13.19
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 $ 16.39Original price $ 16.39 - Original price $ 16.39Original price $ 16.39Current price $ 13.19$ 13.19 - $ 13.19Current price $ 13.19Save 20% -
Original price $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29
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 $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29Save 20% -
Original price $ 22.59Original price $ 22.59 - Original price $ 22.59Original price $ 22.59Current price $ 18.09$ 18.09 - $ 18.09Current price $ 18.09
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 $ 22.59Original price $ 22.59 - Original price $ 22.59Original price $ 22.59Current price $ 18.09$ 18.09 - $ 18.09Current price $ 18.09Save 20% -
Original price $ 27.79Original price $ 27.79 - Original price $ 27.79Original price $ 27.79Current price $ 22.19$ 22.19 - $ 22.19Current price $ 22.19
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 $ 27.79Original price $ 27.79 - Original price $ 27.79Original price $ 27.79Current price $ 22.19$ 22.19 - $ 22.19Current price $ 22.19Save 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, 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 $ 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 $ 28.19Original price $ 28.19 - Original price $ 28.19Original price $ 28.19Current price $ 22.49$ 22.49 - $ 22.49Current price $ 22.49
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 $ 28.19Original price $ 28.19 - Original price $ 28.19Original price $ 28.19Current price $ 22.49$ 22.49 - $ 22.49Current price $ 22.49Save 20% -
Original price $ 28.39Original price $ 28.39 - Original price $ 28.39Original price $ 28.39Current price $ 22.69$ 22.69 - $ 22.69Current price $ 22.69
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 $ 28.39Original price $ 28.39 - Original price $ 28.39Original price $ 28.39Current price $ 22.69$ 22.69 - $ 22.69Current price $ 22.69Save 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, 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 $ 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 $ 16.19Original price $ 16.19 - Original price $ 16.19Original price $ 16.19Current price $ 12.89$ 12.89 - $ 12.89Current price $ 12.89
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 $ 16.19Original price $ 16.19 - Original price $ 16.19Original price $ 16.19Current price $ 12.89$ 12.89 - $ 12.89Current price $ 12.89Save 20% -
Original price $ 2.09Original price $ 2.09 - Original price $ 2.09Original price $ 2.09Current price $ 1.69$ 1.69 - $ 1.69Current price $ 1.69
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 $ 2.09Original price $ 2.09 - Original price $ 2.09Original price $ 2.09Current price $ 1.69$ 1.69 - $ 1.69Current price $ 1.69Save 19% -
Original price $ 12.09Original price $ 12.09 - Original price $ 12.09Original price $ 12.09Current price $ 9.69$ 9.69 - $ 9.69Current price $ 9.69
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 $ 12.09Original price $ 12.09 - Original price $ 12.09Original price $ 12.09Current price $ 9.69$ 9.69 - $ 9.69Current price $ 9.69Save 20% -
Original price $ 10.49Original price $ 10.49 - Original price $ 10.49Original price $ 10.49Current price $ 8.39$ 8.39 - $ 8.39Current price $ 8.39
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 $ 10.49Original price $ 10.49 - Original price $ 10.49Original price $ 10.49Current price $ 8.39$ 8.39 - $ 8.39Current price $ 8.39Save 20% -
Original price $ 9.59Original price $ 9.59 - Original price $ 9.59Original price $ 9.59Current price $ 7.69$ 7.69 - $ 7.69Current price $ 7.69
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 $ 9.59Original price $ 9.59 - Original price $ 9.59Original price $ 9.59Current price $ 7.69$ 7.69 - $ 7.69Current price $ 7.69Save 20% -
Original price $ 9.19Original price $ 9.19 - Original price $ 9.19Original price $ 9.19Current price $ 7.39$ 7.39 - $ 7.39Current price $ 7.39
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 $ 9.19Original price $ 9.19 - Original price $ 9.19Original price $ 9.19Current price $ 7.39$ 7.39 - $ 7.39Current price $ 7.39Save 20% -
Original price $ 32.89Original price $ 32.89 - Original price $ 32.89Original price $ 32.89Current price $ 26.29$ 26.29 - $ 26.29Current price $ 26.29
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 $ 32.89Original price $ 32.89 - Original price $ 32.89Original price $ 32.89Current price $ 26.29$ 26.29 - $ 26.29Current price $ 26.29Save 20% -
Original price $ 19.39Original price $ 19.39 - Original price $ 19.39Original price $ 19.39Current price $ 15.49$ 15.49 - $ 15.49Current price $ 15.49
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 $ 19.39Original price $ 19.39 - Original price $ 19.39Original price $ 19.39Current price $ 15.49$ 15.49 - $ 15.49Current price $ 15.49Save 20% -
Original price $ 25.79Original price $ 25.79 - Original price $ 25.79Original price $ 25.79Current price $ 20.59$ 20.59 - $ 20.59Current price $ 20.59
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 $ 25.79Original price $ 25.79 - Original price $ 25.79Original price $ 25.79Current price $ 20.59$ 20.59 - $ 20.59Current price $ 20.59Save 20% -
Original price $ 14.09Original price $ 14.09 - Original price $ 14.09Original price $ 14.09Current price $ 11.19$ 11.19 - $ 11.19Current price $ 11.19
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 $ 14.09Original price $ 14.09 - Original price $ 14.09Original price $ 14.09Current price $ 11.19$ 11.19 - $ 11.19Current price $ 11.19Save 21% -
Original price $ 8.19Original price $ 8.19 - Original price $ 8.19Original price $ 8.19Current price $ 6.59$ 6.59 - $ 6.59Current price $ 6.59
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 $ 8.19Original price $ 8.19 - Original price $ 8.19Original price $ 8.19Current price $ 6.59$ 6.59 - $ 6.59Current price $ 6.59Save 20% -
Original price $ 17.19Original price $ 17.19 - Original price $ 17.19Original price $ 17.19Current price $ 13.69$ 13.69 - $ 13.69Current price $ 13.69
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 $ 17.19Original price $ 17.19 - Original price $ 17.19Original price $ 17.19Current price $ 13.69$ 13.69 - $ 13.69Current price $ 13.69Save 20% -
Original price $ 8.99Original price $ 8.99 - Original price $ 8.99Original price $ 8.99Current price $ 7.19$ 7.19 - $ 7.19Current price $ 7.19
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 $ 8.99Original price $ 8.99 - Original price $ 8.99Original price $ 8.99Current price $ 7.19$ 7.19 - $ 7.19Current price $ 7.19Save 20% -
Original price $ 62.59Original price $ 62.59 - Original price $ 62.59Original price $ 62.59Current price $ 50.09$ 50.09 - $ 50.09Current price $ 50.09
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 $ 62.59Original price $ 62.59 - Original price $ 62.59Original price $ 62.59Current price $ 50.09$ 50.09 - $ 50.09Current price $ 50.09Save 20% -
Original price $ 13.59Original price $ 13.59 - Original price $ 13.59Original price $ 13.59Current price $ 10.89$ 10.89 - $ 10.89Current price $ 10.89
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 $ 13.59Original price $ 13.59 - Original price $ 13.59Original price $ 13.59Current price $ 10.89$ 10.89 - $ 10.89Current price $ 10.89Save 20%
