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 $ 25.89Original price $ 25.89 - Original price $ 25.89Original price $ 25.89Current price $ 20.69$ 20.69 - $ 20.69Current price $ 20.69
Foster FM3303W, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 25.89Original price $ 25.89 - Original price $ 25.89Original price $ 25.89Current price $ 20.69$ 20.69 - $ 20.69Current price $ 20.69Save 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 SL3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3303 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 $ 22.39Original price $ 22.39 - Original price $ 22.39Original price $ 22.39Current price $ 17.89$ 17.89 - $ 17.89Current price $ 17.89
Foster FM3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 22.39Original price $ 22.39 - Original price $ 22.39Original price $ 22.39Current price $ 17.89$ 17.89 - $ 17.89Current price $ 17.89Save 20% -
Original price $ 30.29Original price $ 30.29 - Original price $ 30.29Original price $ 30.29Current price $ 24.19$ 24.19 - $ 24.19Current price $ 24.19
Foster SL3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 30.29Original price $ 30.29 - Original price $ 30.29Original price $ 30.29Current price $ 24.19$ 24.19 - $ 24.19Current price $ 24.19Save 20% -
Original price $ 25.49Original price $ 25.49 - Original price $ 25.49Original price $ 25.49Current price $ 20.39$ 20.39 - $ 20.39Current price $ 20.39
Foster FM3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 25.49Original price $ 25.49 - Original price $ 25.49Original price $ 25.49Current price $ 20.39$ 20.39 - $ 20.39Current price $ 20.39Save 20% -
Original price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09
Foster FM3103S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09Save 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 SL3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
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 $ 25.49Original price $ 25.49 - Original price $ 25.49Original price $ 25.49Current price $ 20.39$ 20.39 - $ 20.39Current price $ 20.39
Foster FM3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 25.49Original price $ 25.49 - Original price $ 25.49Original price $ 25.49Current price $ 20.39$ 20.39 - $ 20.39Current price $ 20.39Save 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 FM3103H, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Heat/Viton, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
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 $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99
Foster SL3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99Save 20% -
Original price $ 22.39Original price $ 22.39 - Original price $ 22.39Original price $ 22.39Current price $ 17.89$ 17.89 - $ 17.89Current price $ 17.89
Foster FM3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 22.39Original price $ 22.39 - Original price $ 22.39Original price $ 22.39Current price $ 17.89$ 17.89 - $ 17.89Current price $ 17.89Save 20% -
Original price $ 25.29Original price $ 25.29 - Original price $ 25.29Original price $ 25.29Current price $ 20.19$ 20.19 - $ 20.19Current price $ 20.19
Foster SL3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 25.29Original price $ 25.29 - Original price $ 25.29Original price $ 25.29Current price $ 20.19$ 20.19 - $ 20.19Current price $ 20.19Save 20% -
Original price $ 21.99Original price $ 21.99 - Original price $ 21.99Original price $ 21.99Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59
Foster FM3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 21.99Original price $ 21.99 - Original price $ 21.99Original price $ 21.99Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59Save 20% -
Original price $ 26.49Original price $ 26.49 - Original price $ 26.49Original price $ 26.49Current price $ 21.19$ 21.19 - $ 21.19Current price $ 21.19
Foster SL2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 26.49Original price $ 26.49 - Original price $ 26.49Original price $ 26.49Current price $ 21.19$ 21.19 - $ 21.19Current price $ 21.19Save 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 FM2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2903 is a Brass 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 FM3203W, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
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 $ 23.69Original price $ 23.69 - Original price $ 23.69Original price $ 23.69Current price $ 18.99$ 18.99 - $ 18.99Current price $ 18.99
Foster FM3203H, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Heat/Viton, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 23.69Original price $ 23.69 - Original price $ 23.69Original price $ 23.69Current price $ 18.99$ 18.99 - $ 18.99Current price $ 18.99Save 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 SL3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3203 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 $ 22.19Original price $ 22.19 - Original price $ 22.19Original price $ 22.19Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79
Foster FM3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 22.19Original price $ 22.19 - Original price $ 22.19Original price $ 22.19Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79Save 20% -
Original price $ 28.69Original price $ 28.69 - Original price $ 28.69Original price $ 28.69Current price $ 22.99$ 22.99 - $ 22.99Current price $ 22.99
Foster SL3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 28.69Original price $ 28.69 - Original price $ 28.69Original price $ 28.69Current price $ 22.99$ 22.99 - $ 22.99Current price $ 22.99Save 20% -
Original price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09
Foster FM3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09Save 20% -
Original price $ 24.89Original price $ 24.89 - Original price $ 24.89Original price $ 24.89Current price $ 19.89$ 19.89 - $ 19.89Current price $ 19.89
Foster FM3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 24.89Original price $ 24.89 - Original price $ 24.89Original price $ 24.89Current price $ 19.89$ 19.89 - $ 19.89Current price $ 19.89Save 20% -
Original price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09
Foster FM3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 25.09Original price $ 25.09 - Original price $ 25.09Original price $ 25.09Current price $ 20.09$ 20.09 - $ 20.09Current price $ 20.09Save 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 SL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003 is a Brass 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%
