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 $ 21.39Original price $ 21.39 - Original price $ 21.39Original price $ 21.39Current price $ 17.09$ 17.09 - $ 17.09Current price $ 17.09
Foster FM3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 21.39Original price $ 21.39 - Original price $ 21.39Original price $ 21.39Current price $ 17.09$ 17.09 - $ 17.09Current price $ 17.09Save 20% -
Original price $ 24.59Original price $ 24.59 - Original price $ 24.59Original price $ 24.59Current price $ 19.69$ 19.69 - $ 19.69Current price $ 19.69
Foster FM2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 24.59Original price $ 24.59 - Original price $ 24.59Original price $ 24.59Current price $ 19.69$ 19.69 - $ 19.69Current price $ 19.69Save 20% -
Original price $ 23.99Original price $ 23.99 - Original price $ 23.99Original price $ 23.99Current price $ 19.19$ 19.19 - $ 19.19Current price $ 19.19
Foster SL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 23.99Original price $ 23.99 - Original price $ 23.99Original price $ 23.99Current price $ 19.19$ 19.19 - $ 19.19Current price $ 19.19Save 20% -
Original price $ 26.59Original price $ 26.59 - Original price $ 26.59Original price $ 26.59Current price $ 21.29$ 21.29 - $ 21.29Current price $ 21.29
Foster FM2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 26.59Original price $ 26.59 - Original price $ 26.59Original price $ 26.59Current price $ 21.29$ 21.29 - $ 21.29Current price $ 21.29Save 20% -
Original price $ 23.29Original price $ 23.29 - Original price $ 23.29Original price $ 23.29Current price $ 18.69$ 18.69 - $ 18.69Current price $ 18.69
Foster FM2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 23.29Original price $ 23.29 - Original price $ 23.29Original price $ 23.29Current price $ 18.69$ 18.69 - $ 18.69Current price $ 18.69Save 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 SG3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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% -
Original price $ 13.49Original price $ 13.49 - Original price $ 13.49Original price $ 13.49Current price $ 10.79$ 10.79 - $ 10.79Current price $ 10.79
Foster SG3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 13.49Original price $ 13.49 - Original price $ 13.49Original price $ 13.49Current price $ 10.79$ 10.79 - $ 10.79Current price $ 10.79Save 20% -
Original price $ 15.09Original price $ 15.09 - Original price $ 15.09Original price $ 15.09Current price $ 12.09$ 12.09 - $ 12.09Current price $ 12.09
Foster SG1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 15.09Original price $ 15.09 - Original price $ 15.09Original price $ 15.09Current price $ 12.09$ 12.09 - $ 12.09Current price $ 12.09Save 20% -
Original price $ 14.89Original price $ 14.89 - Original price $ 14.89Original price $ 14.89Current price $ 11.89$ 11.89 - $ 11.89Current price $ 11.89
Foster SG1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 14.89Original price $ 14.89 - Original price $ 14.89Original price $ 14.89Current price $ 11.89$ 11.89 - $ 11.89Current price $ 11.89Save 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 SG3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 15.89Original price $ 15.89 - Original price $ 15.89Original price $ 15.89Current price $ 12.69$ 12.69 - $ 12.69Current price $ 12.69
Foster SG3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...
View full detailsOriginal price $ 15.89Original price $ 15.89 - Original price $ 15.89Original price $ 15.89Current price $ 12.69$ 12.69 - $ 12.69Current price $ 12.69Save 20% -
Original price $ 12.99Original price $ 12.99 - Original price $ 12.99Original price $ 12.99Current price $ 10.39$ 10.39 - $ 10.39Current price $ 10.39
Foster SG3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 12.99Original price $ 12.99 - Original price $ 12.99Original price $ 12.99Current price $ 10.39$ 10.39 - $ 10.39Current price $ 10.39Save 20% -
Original price $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.09$ 14.09 - $ 14.09Current price $ 14.09
Foster SG2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.09$ 14.09 - $ 14.09Current price $ 14.09Save 20% -
Original price $ 13.89Original price $ 13.89 - Original price $ 13.89Original price $ 13.89Current price $ 11.09$ 11.09 - $ 11.09Current price $ 11.09
Foster SG3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 13.89Original price $ 13.89 - Original price $ 13.89Original price $ 13.89Current price $ 11.09$ 11.09 - $ 11.09Current price $ 11.09Save 20% -
Original price $ 11.69Original price $ 11.69 - Original price $ 11.69Original price $ 11.69Current price $ 9.39$ 9.39 - $ 9.39Current price $ 9.39
Foster SG3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Less Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003LV is a Brass 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 11.69Original price $ 11.69 - Original price $ 11.69Original price $ 11.69Current price $ 9.39$ 9.39 - $ 9.39Current price $ 9.39Save 20% -
Original price $ 12.89Original price $ 12.89 - Original price $ 12.89Original price $ 12.89Current price $ 10.29$ 10.29 - $ 10.29Current price $ 10.29
Foster SG3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 12.89Original price $ 12.89 - Original price $ 12.89Original price $ 12.89Current price $ 10.29$ 10.29 - $ 10.29Current price $ 10.29Save 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 SG2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Sleeve Guard, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2803 is a Brass 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 $ 4.99Original price $ 4.99 - Original price $ 4.99Original price $ 4.99Current price $ 3.99$ 3.99 - $ 3.99Current price $ 3.99
Foster 3SDC, 1/4" 3 Series Socket Dust Cap, Steel
In stockProtect your 1/4" 3 Series quick sockets when not in use. The Foster 3SDC dust cap keeps dirt, chips, and moisture out of the coupling, helping pre...
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 $ 24.29Original price $ 24.29 - Original price $ 24.29Original price $ 24.29Current price $ 19.49$ 19.49 - $ 19.49Current price $ 19.49
Foster BLSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...
View full detailsOriginal price $ 24.29Original price $ 24.29 - Original price $ 24.29Original price $ 24.29Current price $ 19.49$ 19.49 - $ 19.49Current price $ 19.49Save 20% -
Original price $ 22.49Original price $ 22.49 - Original price $ 22.49Original price $ 22.49Current price $ 17.99$ 17.99 - $ 17.99Current price $ 17.99
Foster SD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 22.49Original price $ 22.49 - Original price $ 22.49Original price $ 22.49Current price $ 17.99$ 17.99 - $ 17.99Current price $ 17.99Save 20% -
Original price $ 23.89Original price $ 23.89 - Original price $ 23.89Original price $ 23.89Current price $ 19.09$ 19.09 - $ 19.09Current price $ 19.09
Foster BLSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD11-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...
View full detailsOriginal price $ 23.89Original price $ 23.89 - Original price $ 23.89Original price $ 23.89Current price $ 19.09$ 19.09 - $ 19.09Current price $ 19.09Save 20% -
Original price $ 22.09Original price $ 22.09 - Original price $ 22.09Original price $ 22.09Current price $ 17.69$ 17.69 - $ 17.69Current price $ 17.69
Foster SD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 22.09Original price $ 22.09 - Original price $ 22.09Original price $ 22.09Current price $ 17.69$ 17.69 - $ 17.69Current price $ 17.69Save 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 BLSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
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 $ 20.49Original price $ 20.49 - Original price $ 20.49Original price $ 20.49Current price $ 16.39$ 16.39 - $ 16.39Current price $ 16.39
Foster SD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 20.49Original price $ 20.49 - Original price $ 20.49Original price $ 20.49Current price $ 16.39$ 16.39 - $ 16.39Current price $ 16.39Save 20%
