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 $ 21.39Original price $ 21.39 - Original price $ 21.39Original price $ 21.39Current price $ 17.09$ 17.09 - $ 17.09Current price $ 17.09
Foster FM3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, 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 $ 2.39Original price $ 2.39 - Original price $ 2.39Original price $ 2.39Current price $ 1.89$ 1.89 - $ 1.89Current price $ 1.89
Foster 10-3, 3 Series, Industrial Plug, 1/4" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 2.39Original price $ 2.39 - Original price $ 2.39Original price $ 2.39Current price $ 1.89$ 1.89 - $ 1.89Current price $ 1.89Save 21% -
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, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, 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 $ 3.79Original price $ 3.79 - Original price $ 3.79Original price $ 3.79Current price $ 3.09$ 3.09 - $ 3.09Current price $ 3.09
Foster 10-3B, 3 Series, Industrial Plug, 1/4" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 3.79Original price $ 3.79 - Original price $ 3.79Original price $ 3.79Current price $ 3.09$ 3.09 - $ 3.09Current price $ 3.09Save 18% -
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, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, 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 $ 2.69Original price $ 2.69 - Original price $ 2.69Original price $ 2.69Current price $ 2.19$ 2.19 - $ 2.19Current price $ 2.19
Foster 11-3, 3 Series, Industrial Plug, 1/4" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 2.69Original price $ 2.69 - Original price $ 2.69Original price $ 2.69Current price $ 2.19$ 2.19 - $ 2.19Current price $ 2.19Save 19% -
Original price $ 2.89Original price $ 2.89 - Original price $ 2.89Original price $ 2.89Current price $ 2.29$ 2.29 - $ 2.29Current price $ 2.29
Foster 12-3, 3 Series, Industrial Plug, 1/8" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 2.89Original price $ 2.89 - Original price $ 2.89Original price $ 2.89Current price $ 2.29$ 2.29 - $ 2.29Current price $ 2.29Save 21% -
Original price $ 3.39Original price $ 3.39 - Original price $ 3.39Original price $ 3.39Current price $ 2.69$ 2.69 - $ 2.69Current price $ 2.69
Foster 16-3, 3 Series, Industrial Plug, 1/4" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 3.39Original price $ 3.39 - Original price $ 3.39Original price $ 3.39Current price $ 2.69$ 2.69 - $ 2.69Current price $ 2.69Save 21% -
Original price $ 4.79Original price $ 4.79 - Original price $ 4.79Original price $ 4.79Current price $ 3.79$ 3.79 - $ 3.79Current price $ 3.79
Foster 11-3B, 3 Series, Industrial Plug, 1/4" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 4.79Original price $ 4.79 - Original price $ 4.79Original price $ 4.79Current price $ 3.79$ 3.79 - $ 3.79Current price $ 3.79Save 21% -
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, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, 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 $ 23.49Original price $ 23.49 - Original price $ 23.49Original price $ 23.49Current price $ 18.79$ 18.79 - $ 18.79Current price $ 18.79
Foster 3003GB, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GB 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 $ 12.99Original price $ 12.99 - Original price $ 12.99Original price $ 12.99Current price $ 10.39$ 10.39 - $ 10.39Current price $ 10.39
Foster SG3103, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Male NPT, 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 $ 5.59Original price $ 5.59 - Original price $ 5.59Original price $ 5.59Current price $ 4.49$ 4.49 - $ 4.49Current price $ 4.49
Foster 13-3B, 3 Series, Industrial Plug, 1/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 5.59Original price $ 5.59 - Original price $ 5.59Original price $ 5.59Current price $ 4.49$ 4.49 - $ 4.49Current price $ 4.49Save 20% -
Original price $ 7.29Original price $ 7.29 - Original price $ 7.29Original price $ 7.29Current price $ 5.89$ 5.89 - $ 5.89Current price $ 5.89
Foster 17-3B, 3 Series, Industrial Plug, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 7.29Original price $ 7.29 - Original price $ 7.29Original price $ 7.29Current price $ 5.89$ 5.89 - $ 5.89Current price $ 5.89Save 19% -
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 3003GS, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GS is a Steel 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 $ 3.79Original price $ 3.79 - Original price $ 3.79Original price $ 3.79Current price $ 2.99$ 2.99 - $ 2.99Current price $ 2.99
Foster 17-3, 3 Series, Industrial Plug, 3/8" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 3.79Original price $ 3.79 - Original price $ 3.79Original price $ 3.79Current price $ 2.99$ 2.99 - $ 2.99Current price $ 2.99Save 21% -
Original price $ 14.39Original price $ 14.39 - Original price $ 14.39Original price $ 14.39Current price $ 11.49$ 11.49 - $ 11.49Current price $ 11.49
Foster 3603, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 14.39Original price $ 14.39 - Original price $ 14.39Original price $ 14.39Current price $ 11.49$ 11.49 - $ 11.49Current price $ 11.49Save 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, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, 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 $ 12.89Original price $ 12.89 - Original price $ 12.89Original price $ 12.89Current price $ 10.29$ 10.29 - $ 10.29Current price $ 10.29
Foster SG3003, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Female NPT, 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 $ 14.99Original price $ 14.99 - Original price $ 14.99Original price $ 14.99Current price $ 11.99$ 11.99 - $ 11.99Current price $ 11.99
Foster 3303, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303 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 $ 15.69Original price $ 15.69 - Original price $ 15.69Original price $ 15.69Current price $ 12.59$ 12.59 - $ 12.59Current price $ 12.59
Foster 3703, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 15.69Original price $ 15.69 - Original price $ 15.69Original price $ 15.69Current price $ 12.59$ 12.59 - $ 12.59Current price $ 12.59Save 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, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Brass (HOT WATER)
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 $ 22.39Original price $ 22.39 - Original price $ 22.39Original price $ 22.39Current price $ 17.89$ 17.89 - $ 17.89Current price $ 17.89
Foster FM3303, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, 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 $ 13.49Original price $ 13.49 - Original price $ 13.49Original price $ 13.49Current price $ 10.79$ 10.79 - $ 10.79Current price $ 10.79
Foster SG3603, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Hose Barb, 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%
