Foster
Foster quick couplers set the standard in pneumatic and hydraulic connections. Part of the ZSI-Foster line, Foster couplers and plugs cover the full range of industrial interchanges and body sizes in steel, brass, and stainless construction. Built for reliable, repeatable connections in air and fluid systems. Shop the full Foster range below.
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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 42-4B, 3/8" Industrial Plug x 3/8" Male NPT, 4 Series, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 42-4B is a Brass 3/8" industrial plug from the Foster 4 Series — a high-fl...
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 $ 4.99Original price $ 4.99 - Original price $ 4.99Original price $ 4.99Current price $ 3.99$ 3.99 - $ 3.99Current price $ 3.99
Foster 42-4, 3/8" Industrial Plug x 3/8" Male NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 42-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
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 $ 10.49Original price $ 10.49 - Original price $ 10.49Original price $ 10.49Current price $ 8.39$ 8.39 - $ 8.39Current price $ 8.39
Foster 40-4S/S, 3/8" Industrial Plug x 1/4" Male NPT, 4 Series, 303 Stainless
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 40-4S/S is a 303 Stainless 3/8" industrial plug from the Foster 4 Series —...
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 $ 9.19Original price $ 9.19 - Original price $ 9.19Original price $ 9.19Current price $ 7.29$ 7.29 - $ 7.29Current price $ 7.29
Foster 40-4B, 3/8" Industrial Plug x 1/4" Male NPT, 4 Series, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 40-4B is a Brass 3/8" industrial plug from the Foster 4 Series — a high-fl...
View full detailsOriginal price $ 9.19Original price $ 9.19 - Original price $ 9.19Original price $ 9.19Current price $ 7.29$ 7.29 - $ 7.29Current price $ 7.29Save 21% -
Original price $ 5.39Original price $ 5.39 - Original price $ 5.39Original price $ 5.39Current price $ 4.29$ 4.29 - $ 4.29Current price $ 4.29
Foster 40-4, 3/8" Industrial Plug x 1/4" Male NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 40-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
View full detailsOriginal price $ 5.39Original price $ 5.39 - Original price $ 5.39Original price $ 5.39Current price $ 4.29$ 4.29 - $ 4.29Current price $ 4.29Save 20% -
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 38-4, 3/8" Industrial Plug x 1/8" Male NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 38-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
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 $ 9.29Original price $ 9.29 - Original price $ 9.29Original price $ 9.29Current price $ 7.39$ 7.39 - $ 7.39Current price $ 7.39
Foster 45-4, 3/8" Industrial Plug x 1/2" Female NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 45-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
View full detailsOriginal price $ 9.29Original price $ 9.29 - Original price $ 9.29Original price $ 9.29Current price $ 7.39$ 7.39 - $ 7.39Current price $ 7.39Save 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 43-4S/S, 3/8" Industrial Plug x 3/8" Female NPT, 4 Series, 303 Stainless
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 43-4S/S is a 303 Stainless 3/8" industrial plug from the Foster 4 Series —...
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 $ 6.69Original price $ 6.69 - Original price $ 6.69Original price $ 6.69Current price $ 5.39$ 5.39 - $ 5.39Current price $ 5.39
Foster 43-4, 3/8" Industrial Plug x 3/8" Female NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 43-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
View full detailsOriginal price $ 6.69Original price $ 6.69 - Original price $ 6.69Original price $ 6.69Current price $ 5.39$ 5.39 - $ 5.39Current price $ 5.39Save 19% -
Original price $ 5.39Original price $ 5.39 - Original price $ 5.39Original price $ 5.39Current price $ 4.29$ 4.29 - $ 4.29Current price $ 4.29
Foster 41-4, 3/8" Industrial Plug x 1/4" Female NPT, 4 Series, Steel
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster 41-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...
View full detailsOriginal price $ 5.39Original price $ 5.39 - Original price $ 5.39Original price $ 5.39Current price $ 4.29$ 4.29 - $ 4.29Current price $ 4.29Save 20% -
Original price $ 44.19Original price $ 44.19 - Original price $ 44.19Original price $ 44.19Current price $ 35.39$ 35.39 - $ 35.39Current price $ 35.39
Foster SLSD13-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD13-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...
View full detailsOriginal price $ 44.19Original price $ 44.19 - Original price $ 44.19Original price $ 44.19Current price $ 35.39$ 35.39 - $ 35.39Current price $ 35.39Save 20% -
Original price $ 38.69Original price $ 38.69 - Original price $ 38.69Original price $ 38.69Current price $ 30.99$ 30.99 - $ 30.99Current price $ 30.99
Foster FMSD13-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD13-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...
View full detailsOriginal price $ 38.69Original price $ 38.69 - Original price $ 38.69Original price $ 38.69Current price $ 30.99$ 30.99 - $ 30.99Current price $ 30.99Save 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 SLSD11-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD11-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...
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 $ 38.09Original price $ 38.09 - Original price $ 38.09Original price $ 38.09Current price $ 30.49$ 30.49 - $ 30.49Current price $ 30.49
Foster FMSD11-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD11-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...
View full detailsOriginal price $ 38.09Original price $ 38.09 - Original price $ 38.09Original price $ 38.09Current price $ 30.49$ 30.49 - $ 30.49Current price $ 30.49Save 20% -
Original price $ 43.19Original price $ 43.19 - Original price $ 43.19Original price $ 43.19Current price $ 34.49$ 34.49 - $ 34.49Current price $ 34.49
Foster SLSD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD9-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 43.19Original price $ 43.19 - Original price $ 43.19Original price $ 43.19Current price $ 34.49$ 34.49 - $ 34.49Current price $ 34.49Save 20% -
Original price $ 37.49Original price $ 37.49 - Original price $ 37.49Original price $ 37.49Current price $ 29.99$ 29.99 - $ 29.99Current price $ 29.99
Foster FMSD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD9-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 37.49Original price $ 37.49 - Original price $ 37.49Original price $ 37.49Current price $ 29.99$ 29.99 - $ 29.99Current price $ 29.99Save 20% -
Original price $ 42.49Original price $ 42.49 - Original price $ 42.49Original price $ 42.49Current price $ 33.99$ 33.99 - $ 33.99Current price $ 33.99
Foster SLSD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 42.49Original price $ 42.49 - Original price $ 42.49Original price $ 42.49Current price $ 33.99$ 33.99 - $ 33.99Current price $ 33.99Save 20% -
Original price $ 50.39Original price $ 50.39 - Original price $ 50.39Original price $ 50.39Current price $ 40.29$ 40.29 - $ 40.29Current price $ 40.29
Foster FMSD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 50.39Original price $ 50.39 - Original price $ 50.39Original price $ 50.39Current price $ 40.29$ 40.29 - $ 40.29Current price $ 40.29Save 20% -
Original price $ 42.49Original price $ 42.49 - Original price $ 42.49Original price $ 42.49Current price $ 33.99$ 33.99 - $ 33.99Current price $ 33.99
Foster SLSB7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 42.49Original price $ 42.49 - Original price $ 42.49Original price $ 42.49Current price $ 33.99$ 33.99 - $ 33.99Current price $ 33.99Save 20% -
Original price $ 38.29Original price $ 38.29 - Original price $ 38.29Original price $ 38.29Current price $ 30.59$ 30.59 - $ 30.59Current price $ 30.59
Foster FMSB7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 38.29Original price $ 38.29 - Original price $ 38.29Original price $ 38.29Current price $ 30.59$ 30.59 - $ 30.59Current price $ 30.59Save 20% -
Original price $ 42.09Original price $ 42.09 - Original price $ 42.09Original price $ 42.09Current price $ 33.69$ 33.69 - $ 33.69Current price $ 33.69
Foster SLSB5-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB5-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 42.09Original price $ 42.09 - Original price $ 42.09Original price $ 42.09Current price $ 33.69$ 33.69 - $ 33.69Current price $ 33.69Save 20% -
Original price $ 37.89Original price $ 37.89 - Original price $ 37.89Original price $ 37.89Current price $ 30.29$ 30.29 - $ 30.29Current price $ 30.29
Foster FMSB5-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB5-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 37.89Original price $ 37.89 - Original price $ 37.89Original price $ 37.89Current price $ 30.29$ 30.29 - $ 30.29Current price $ 30.29Save 20% -
Original price $ 39.59Original price $ 39.59 - Original price $ 39.59Original price $ 39.59Current price $ 31.69$ 31.69 - $ 31.69Current price $ 31.69
Foster SLSB3-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 4 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB3-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 39.59Original price $ 39.59 - Original price $ 39.59Original price $ 39.59Current price $ 31.69$ 31.69 - $ 31.69Current price $ 31.69Save 20% -
Original price $ 35.59Original price $ 35.59 - Original price $ 35.59Original price $ 35.59Current price $ 28.49$ 28.49 - $ 28.49Current price $ 28.49
Foster FMSB3-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 4 Series, Automatic, Brass
In stockReliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB3-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...
View full detailsOriginal price $ 35.59Original price $ 35.59 - Original price $ 35.59Original price $ 35.59Current price $ 28.49$ 28.49 - $ 28.49Current price $ 28.49Save 20%
