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 $ 3.29Original price $ 3.29 - Original price $ 3.29Original price $ 3.29Current price $ 2.59$ 2.59 - $ 2.59Current price $ 2.59
Foster 13-3, 3 Series, Industrial Plug, 1/8" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 3.29Original price $ 3.29 - Original price $ 3.29Original price $ 3.29Current price $ 2.59$ 2.59 - $ 2.59Current price $ 2.59Save 21% -
Original price $ 8.49Original price $ 8.49 - Original price $ 8.49Original price $ 8.49Current price $ 6.79$ 6.79 - $ 6.79Current price $ 6.79
Foster 165-3, 3 Series, Industrial Plug, 5/16" Hose Barb, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 165-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 8.49Original price $ 8.49 - Original price $ 8.49Original price $ 8.49Current price $ 6.79$ 6.79 - $ 6.79Current price $ 6.79Save 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 3603GS, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 15.09Original price $ 15.09 - Original price $ 15.09Original price $ 15.09Current price $ 12.09$ 12.09 - $ 12.09Current price $ 12.09
Foster SG1713, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Push-On Hose Barb, 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 $ 4.59Original price $ 4.59 - Original price $ 4.59Original price $ 4.59Current price $ 3.69$ 3.69 - $ 3.69Current price $ 3.69
Foster 71-3, 3 Series, Industrial Plug, 3/8" Hose Barb (Push-On), Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 71-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 4.59Original price $ 4.59 - Original price $ 4.59Original price $ 4.59Current price $ 3.69$ 3.69 - $ 3.69Current price $ 3.69Save 20% -
Original price $ 65.89Original price $ 65.89 - Original price $ 65.89Original price $ 65.89Current price $ 52.69$ 52.69 - $ 52.69Current price $ 52.69
Foster 3303S/S, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 65.89Original price $ 65.89 - Original price $ 65.89Original price $ 65.89Current price $ 52.69$ 52.69 - $ 52.69Current price $ 52.69Save 20% -
Original price $ 29.19Original price $ 29.19 - Original price $ 29.19Original price $ 29.19Current price $ 23.39$ 23.39 - $ 23.39Current price $ 23.39
Foster 3203GB, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 29.19Original price $ 29.19 - Original price $ 29.19Original price $ 29.19Current price $ 23.39$ 23.39 - $ 23.39Current price $ 23.39Save 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, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass With Ball Sleeve Lock
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% -
Original price $ 7.99Original price $ 7.99 - Original price $ 7.99Original price $ 7.99Current price $ 6.39$ 6.39 - $ 6.39Current price $ 6.39
Foster 16-3B, 3 Series, Industrial Plug, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 7.99Original price $ 7.99 - Original price $ 7.99Original price $ 7.99Current price $ 6.39$ 6.39 - $ 6.39Current price $ 6.39Save 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, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Female NPT, 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 $ 14.09Original price $ 14.09 - Original price $ 14.09Original price $ 14.09Current price $ 11.19$ 11.19 - $ 11.19Current price $ 11.19
Foster SG3303, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Male NPT, 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 $ 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, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Stainless Steel
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 $ 4.99Original price $ 4.99 - Original price $ 4.99Original price $ 4.99Current price $ 3.99$ 3.99 - $ 3.99Current price $ 3.99
Foster 12-3B, 3 Series, Industrial Plug, 1/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
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 $ 26.69Original price $ 26.69 - Original price $ 26.69Original price $ 26.69Current price $ 21.39$ 21.39 - $ 21.39Current price $ 21.39
Foster 3103GB, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.69$ 23.69 - $ 23.69Current price $ 23.69
Foster 3703GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 29.69Original price $ 29.69 - Original price $ 29.69Original price $ 29.69Current price $ 23.69$ 23.69 - $ 23.69Current price $ 23.69Save 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 14-3, 3 Series, Industrial Plug, 3/8" Male NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3 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 $ 15.19Original price $ 15.19 - Original price $ 15.19Original price $ 15.19Current price $ 12.19$ 12.19 - $ 12.19Current price $ 12.19
Foster 3203, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, 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 $ 5.79Original price $ 5.79 - Original price $ 5.79Original price $ 5.79Current price $ 4.59$ 4.59 - $ 4.59Current price $ 4.59
Foster 15-3, 3 Series, Industrial Plug, 3/8" Female NPT, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 5.79Original price $ 5.79 - Original price $ 5.79Original price $ 5.79Current price $ 4.59$ 4.59 - $ 4.59Current price $ 4.59Save 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 FM1713, 3 Series, Industrial Coupler, Automatic, 3/8" Push-On Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1713 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 $ 22.79Original price $ 22.79 - Original price $ 22.79Original price $ 22.79Current price $ 18.29$ 18.29 - $ 18.29Current price $ 18.29
Foster FM3603, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 22.79Original price $ 22.79 - Original price $ 22.79Original price $ 22.79Current price $ 18.29$ 18.29 - $ 18.29Current price $ 18.29Save 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 FM3703, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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 $ 13.59Original price $ 13.59 - Original price $ 13.59Original price $ 13.59Current price $ 10.89$ 10.89 - $ 10.89Current price $ 10.89
Foster SG3703, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Hose Barb, 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 $ 16.19Original price $ 16.19 - Original price $ 16.19Original price $ 16.19Current price $ 12.89$ 12.89 - $ 12.89Current price $ 12.89
Foster 1713, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb (Push-On), Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 16.19Original price $ 16.19 - Original price $ 16.19Original price $ 16.19Current price $ 12.89$ 12.89 - $ 12.89Current price $ 12.89Save 20% -
Original price $ 9.39Original price $ 9.39 - Original price $ 9.39Original price $ 9.39Current price $ 7.49$ 7.49 - $ 7.49Current price $ 7.49
Foster 14-3B, 3 Series, Industrial Plug, 3/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 9.39Original price $ 9.39 - Original price $ 9.39Original price $ 9.39Current price $ 7.49$ 7.49 - $ 7.49Current price $ 7.49Save 20%
