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 $ 27.79Original price $ 27.79 - Original price $ 27.79Original price $ 27.79Current price $ 22.19$ 22.19 - $ 22.19Current price $ 22.19
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 $ 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 $ 28.39Original price $ 28.39 - Original price $ 28.39Original price $ 28.39Current price $ 22.69$ 22.69 - $ 22.69Current price $ 22.69
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 $ 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 $ 22.59Original price $ 22.59 - Original price $ 22.59Original price $ 22.59Current price $ 18.09$ 18.09 - $ 18.09Current price $ 18.09
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 $ 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 $ 28.79Original price $ 28.79 - Original price $ 28.79Original price $ 28.79Current price $ 23.09$ 23.09 - $ 23.09Current price $ 23.09
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 $ 28.79Original price $ 28.79 - Original price $ 28.79Original price $ 28.79Current price $ 23.09$ 23.09 - $ 23.09Current price $ 23.09Save 20% -
Original price $ 22.29Original price $ 22.29 - Original price $ 22.29Original price $ 22.29Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79
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 $ 22.29Original price $ 22.29 - Original price $ 22.29Original price $ 22.29Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79Save 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, 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 $ 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 $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29
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 $ 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 $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39
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 $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39Save 20% -
Original price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 21.09$ 21.09 - $ 21.09Current price $ 21.09
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 $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 21.09$ 21.09 - $ 21.09Current price $ 21.09Save 20% -
Original price $ 36.89Original price $ 36.89 - Original price $ 36.89Original price $ 36.89Current price $ 29.49$ 29.49 - $ 29.49Current price $ 29.49
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 $ 36.89Original price $ 36.89 - Original price $ 36.89Original price $ 36.89Current price $ 29.49$ 29.49 - $ 29.49Current price $ 29.49Save 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, 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 $ 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 $ 29.19Original price $ 29.19 - Original price $ 29.19Original price $ 29.19Current price $ 23.39$ 23.39 - $ 23.39Current price $ 23.39
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 $ 29.19Original price $ 29.19 - Original price $ 29.19Original price $ 29.19Current price $ 23.39$ 23.39 - $ 23.39Current price $ 23.39Save 20% -
Original price $ 21.49Original price $ 21.49 - Original price $ 21.49Original price $ 21.49Current price $ 17.19$ 17.19 - $ 17.19Current price $ 17.19
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 $ 21.49Original price $ 21.49 - Original price $ 21.49Original price $ 21.49Current price $ 17.19$ 17.19 - $ 17.19Current price $ 17.19Save 20% -
Original price $ 23.49Original price $ 23.49 - Original price $ 23.49Original price $ 23.49Current price $ 18.79$ 18.79 - $ 18.79Current price $ 18.79
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 $ 23.49Original price $ 23.49 - Original price $ 23.49Original price $ 23.49Current price $ 18.79$ 18.79 - $ 18.79Current price $ 18.79Save 20% -
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, 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 $ 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 $ 25.69Original price $ 25.69 - Original price $ 25.69Original price $ 25.69Current price $ 20.49$ 20.49 - $ 20.49Current price $ 20.49
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 $ 25.69Original price $ 25.69 - Original price $ 25.69Original price $ 25.69Current price $ 20.49$ 20.49 - $ 20.49Current price $ 20.49Save 20% -
Original price $ 34.49Original price $ 34.49 - Original price $ 34.49Original price $ 34.49Current price $ 27.59$ 27.59 - $ 27.59Current price $ 27.59
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 $ 34.49Original price $ 34.49 - Original price $ 34.49Original price $ 34.49Current price $ 27.59$ 27.59 - $ 27.59Current price $ 27.59Save 20% -
Original price $ 32.79Original price $ 32.79 - Original price $ 32.79Original price $ 32.79Current price $ 26.19$ 26.19 - $ 26.19Current price $ 26.19
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 $ 32.79Original price $ 32.79 - Original price $ 32.79Original price $ 32.79Current price $ 26.19$ 26.19 - $ 26.19Current price $ 26.19Save 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 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 $ 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 $ 31.79Original price $ 31.79 - Original price $ 31.79Original price $ 31.79Current price $ 25.39$ 25.39 - $ 25.39Current price $ 25.39
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 $ 31.79Original price $ 31.79 - Original price $ 31.79Original price $ 31.79Current price $ 25.39$ 25.39 - $ 25.39Current price $ 25.39Save 20% -
Original price $ 43.79Original price $ 43.79 - Original price $ 43.79Original price $ 43.79Current price $ 35.09$ 35.09 - $ 35.09Current price $ 35.09
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 $ 43.79Original price $ 43.79 - Original price $ 43.79Original price $ 43.79Current price $ 35.09$ 35.09 - $ 35.09Current price $ 35.09Save 20% -
Original price $ 43.79Original price $ 43.79 - Original price $ 43.79Original price $ 43.79Current price $ 35.09$ 35.09 - $ 35.09Current price $ 35.09
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 $ 43.79Original price $ 43.79 - Original price $ 43.79Original price $ 43.79Current price $ 35.09$ 35.09 - $ 35.09Current price $ 35.09Save 20% -
Original price $ 33.19Original price $ 33.19 - Original price $ 33.19Original price $ 33.19Current price $ 26.59$ 26.59 - $ 26.59Current price $ 26.59
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 $ 33.19Original price $ 33.19 - Original price $ 33.19Original price $ 33.19Current price $ 26.59$ 26.59 - $ 26.59Current price $ 26.59Save 20% -
Original price $ 29.89Original price $ 29.89 - Original price $ 29.89Original price $ 29.89Current price $ 23.99$ 23.99 - $ 23.99Current price $ 23.99
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 $ 29.89Original price $ 29.89 - Original price $ 29.89Original price $ 29.89Current price $ 23.99$ 23.99 - $ 23.99Current price $ 23.99Save 20%
