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.
-
Original price $ 47.39Original price $ 47.39 - Original price $ 47.39Original price $ 47.39Current price $ 37.89$ 37.89 - $ 37.89Current price $ 37.89
Foster 3003S/SH, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/SH is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 47.39Original price $ 47.39 - Original price $ 47.39Original price $ 47.39Current price $ 37.89$ 37.89 - $ 37.89Current price $ 37.89Save 20% -
Original price $ 49.89Original price $ 49.89 - Original price $ 49.89Original price $ 49.89Current price $ 39.89$ 39.89 - $ 39.89Current price $ 39.89
Foster BL3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 49.89Original price $ 49.89 - Original price $ 49.89Original price $ 49.89Current price $ 39.89$ 39.89 - $ 39.89Current price $ 39.89Save 20% -
Original price $ 44.29Original price $ 44.29 - Original price $ 44.29Original price $ 44.29Current price $ 35.39$ 35.39 - $ 35.39Current price $ 35.39
Foster 3003S/S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 44.29Original price $ 44.29 - Original price $ 44.29Original price $ 44.29Current price $ 35.39$ 35.39 - $ 35.39Current price $ 35.39Save 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 3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S 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 $ 14.09Original price $ 14.09 - Original price $ 14.09Original price $ 14.09Current price $ 11.29$ 11.29 - $ 11.29Current price $ 11.29
Foster 3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Less Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003LV is a Steel 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 $ 11.29$ 11.29 - $ 11.29Current price $ 11.29Save 20% -
Original price $ 19.89Original price $ 19.89 - Original price $ 19.89Original price $ 19.89Current price $ 15.89$ 15.89 - $ 15.89Current price $ 15.89
Foster 3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Hot Water/Viton, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 19.89Original price $ 19.89 - Original price $ 19.89Original price $ 19.89Current price $ 15.89$ 15.89 - $ 15.89Current price $ 15.89Save 20% -
Original price $ 16.69Original price $ 16.69 - Original price $ 16.69Original price $ 16.69Current price $ 13.29$ 13.29 - $ 13.29Current price $ 13.29
Foster 3003H, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
View full detailsOriginal price $ 16.69Original price $ 16.69 - Original price $ 16.69Original price $ 16.69Current price $ 13.29$ 13.29 - $ 13.29Current price $ 13.29Save 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 3003D, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Dill Valve, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003D 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 $ 17.89Original price $ 17.89 - Original price $ 17.89Original price $ 17.89Current price $ 14.29$ 14.29 - $ 14.29Current price $ 14.29
Foster BL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3003 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 $ 14.99Original price $ 14.99 - Original price $ 14.99Original price $ 14.99Current price $ 11.99$ 11.99 - $ 11.99Current price $ 11.99
Foster 3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 14.99Original price $ 14.99 - Original price $ 14.99Original price $ 14.99Current price $ 11.99$ 11.99 - $ 11.99Current price $ 11.99Save 20% -
Original price $ 23.19Original price $ 23.19 - Original price $ 23.19Original price $ 23.19Current price $ 18.59$ 18.59 - $ 18.59Current price $ 18.59
Foster 2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 23.19Original price $ 23.19 - Original price $ 23.19Original price $ 23.19Current price $ 18.59$ 18.59 - $ 18.59Current price $ 18.59Save 20% -
Original price $ 59.59Original price $ 59.59 - Original price $ 59.59Original price $ 59.59Current price $ 47.69$ 47.69 - $ 47.69Current price $ 47.69
Foster 2803S/S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 59.59Original price $ 59.59 - Original price $ 59.59Original price $ 59.59Current price $ 47.69$ 47.69 - $ 47.69Current price $ 47.69Save 20% -
Original price $ 23.59Original price $ 23.59 - Original price $ 23.59Original price $ 23.59Current price $ 18.89$ 18.89 - $ 18.89Current price $ 18.89
Foster 2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 23.59Original price $ 23.59 - Original price $ 23.59Original price $ 23.59Current price $ 18.89$ 18.89 - $ 18.89Current price $ 18.89Save 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 2803H, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
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 $ 19.49Original price $ 19.49 - Original price $ 19.49Original price $ 19.49Current price $ 15.59$ 15.59 - $ 15.59Current price $ 15.59
Foster BL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL2803 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 19.49Original price $ 19.49 - Original price $ 19.49Original price $ 19.49Current price $ 15.59$ 15.59 - $ 15.59Current price $ 15.59Save 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 2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
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%
