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 $ 48.19Original price $ 48.19 - Original price $ 48.19Original price $ 48.19Current price $ 38.49$ 38.49 - $ 38.49Current price $ 38.49
Foster BL3103S/S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 48.19Original price $ 48.19 - Original price $ 48.19Original price $ 48.19Current price $ 38.49$ 38.49 - $ 38.49Current price $ 38.49Save 20% -
Original price $ 44.99Original price $ 44.99 - Original price $ 44.99Original price $ 44.99Current price $ 35.99$ 35.99 - $ 35.99Current price $ 35.99
Foster 3103S/S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 44.99Original price $ 44.99 - Original price $ 44.99Original price $ 44.99Current price $ 35.99$ 35.99 - $ 35.99Current price $ 35.99Save 20% -
Original price $ 17.29Original price $ 17.29 - Original price $ 17.29Original price $ 17.29Current price $ 13.89$ 13.89 - $ 13.89Current price $ 13.89
Foster 3103S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 17.29Original price $ 17.29 - Original price $ 17.29Original price $ 17.29Current price $ 13.89$ 13.89 - $ 13.89Current price $ 13.89Save 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 3103LV, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Less Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103LV is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
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 $ 15.19Original price $ 15.19 - Original price $ 15.19Original price $ 15.19Current price $ 12.19$ 12.19 - $ 12.19Current price $ 12.19
Foster 3103H, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Heat/Viton, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103H is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 15.19Original price $ 15.19 - Original price $ 15.19Original price $ 15.19Current price $ 12.19$ 12.19 - $ 12.19Current price $ 12.19Save 20% -
Original price $ 13.99Original price $ 13.99 - Original price $ 13.99Original price $ 13.99Current price $ 11.19$ 11.19 - $ 11.19Current price $ 11.19
Foster 3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Dill Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103D is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 13.99Original price $ 13.99 - Original price $ 13.99Original price $ 13.99Current price $ 11.19$ 11.19 - $ 11.19Current price $ 11.19Save 20% -
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 BL3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
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 $ 13.59Original price $ 13.59 - Original price $ 13.59Original price $ 13.59Current price $ 10.89$ 10.89 - $ 10.89Current price $ 10.89
Foster 3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
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 $ 77.19Original price $ 77.19 - Original price $ 77.19Original price $ 77.19Current price $ 61.69$ 61.69 - $ 61.69Current price $ 61.69
Foster BL2903S/S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2903S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 77.19Original price $ 77.19 - Original price $ 77.19Original price $ 77.19Current price $ 61.69$ 61.69 - $ 61.69Current price $ 61.69Save 20% -
Original price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79
Foster 2903S/S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79Save 20% -
Original price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.79$ 15.79 - $ 15.79Current price $ 15.79
Foster 2903S, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.79$ 15.79 - $ 15.79Current price $ 15.79Save 20% -
Original price $ 18.49Original price $ 18.49 - Original price $ 18.49Original price $ 18.49Current price $ 14.79$ 14.79 - $ 14.79Current price $ 14.79
Foster 2903H, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 18.49Original price $ 18.49 - Original price $ 18.49Original price $ 18.49Current price $ 14.79$ 14.79 - $ 14.79Current price $ 14.79Save 20% -
Original price $ 17.89Original price $ 17.89 - Original price $ 17.89Original price $ 17.89Current price $ 14.29$ 14.29 - $ 14.29Current price $ 14.29
Foster BL2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2903 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 17.89Original price $ 17.89 - Original price $ 17.89Original price $ 17.89Current price $ 14.29$ 14.29 - $ 14.29Current price $ 14.29Save 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 2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, 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 $ 18.99Original price $ 18.99 - Original price $ 18.99Original price $ 18.99Current price $ 15.19$ 15.19 - $ 15.19Current price $ 15.19
Foster 3203W, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 18.99Original price $ 18.99 - Original price $ 18.99Original price $ 18.99Current price $ 15.19$ 15.19 - $ 15.19Current price $ 15.19Save 20% -
Original price $ 67.59Original price $ 67.59 - Original price $ 67.59Original price $ 67.59Current price $ 54.09$ 54.09 - $ 54.09Current price $ 54.09
Foster 3203S/SLV, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Less Valve, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/SLV is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 67.59Original price $ 67.59 - Original price $ 67.59Original price $ 67.59Current price $ 54.09$ 54.09 - $ 54.09Current price $ 54.09Save 20% -
Original price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79
Foster BL3203S/S, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79Save 20% -
Original price $ 66.39Original price $ 66.39 - Original price $ 66.39Original price $ 66.39Current price $ 53.09$ 53.09 - $ 53.09Current price $ 53.09
Foster 3203S/S, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 66.39Original price $ 66.39 - Original price $ 66.39Original price $ 66.39Current price $ 53.09$ 53.09 - $ 53.09Current price $ 53.09Save 20% -
Original price $ 14.19Original price $ 14.19 - Original price $ 14.19Original price $ 14.19Current price $ 11.39$ 11.39 - $ 11.39Current price $ 11.39
Foster 3203LV, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Less Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203LV is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 14.19Original price $ 14.19 - Original price $ 14.19Original price $ 14.19Current price $ 11.39$ 11.39 - $ 11.39Current price $ 11.39Save 20% -
Original price $ 16.49Original price $ 16.49 - Original price $ 16.49Original price $ 16.49Current price $ 13.19$ 13.19 - $ 13.19Current price $ 13.19
Foster 3203H, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 16.49Original price $ 16.49 - Original price $ 16.49Original price $ 16.49Current price $ 13.19$ 13.19 - $ 13.19Current price $ 13.19Save 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 BL3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
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 $ 15.19Original price $ 15.19 - Original price $ 15.19Original price $ 15.19Current price $ 12.19$ 12.19 - $ 12.19Current price $ 12.19
Foster 3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 15.19Original price $ 15.19 - Original price $ 15.19Original price $ 15.19Current price $ 12.19$ 12.19 - $ 12.19Current price $ 12.19Save 20% -
Original price $ 23.39Original price $ 23.39 - Original price $ 23.39Original price $ 23.39Current price $ 18.69$ 18.69 - $ 18.69Current price $ 18.69
Foster BL3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 23.39Original price $ 23.39 - Original price $ 23.39Original price $ 23.39Current price $ 18.69$ 18.69 - $ 18.69Current price $ 18.69Save 20% -
Original price $ 19.19Original price $ 19.19 - Original price $ 19.19Original price $ 19.19Current price $ 15.29$ 15.29 - $ 15.29Current price $ 15.29
Foster 3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 19.19Original price $ 19.19 - Original price $ 19.19Original price $ 19.19Current price $ 15.29$ 15.29 - $ 15.29Current price $ 15.29Save 20%
