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 $ 5.19Original price $ 5.19 - Original price $ 5.19Original price $ 5.19Current price $ 4.09$ 4.09 - $ 4.09Current price $ 4.09
Foster 51-3, 3 Series, Industrial Plug, 1/4" Hose Barb (Push-On), Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 51-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...
View full detailsOriginal price $ 5.19Original price $ 5.19 - Original price $ 5.19Original price $ 5.19Current price $ 4.09$ 4.09 - $ 4.09Current price $ 4.09Save 21% -
Original price $ 12.49Original price $ 12.49 - Original price $ 12.49Original price $ 12.49Current price $ 9.99$ 9.99 - $ 9.99Current price $ 9.99
Foster 12-3S/S, 3 Series, Industrial Plug, 1/8" Male NPT, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 12.49Original price $ 12.49 - Original price $ 12.49Original price $ 12.49Current price $ 9.99$ 9.99 - $ 9.99Current price $ 9.99Save 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, 3 Series, Industrial Coupler, Manual, 1/8" Female NPT, 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% -
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, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, 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 $ 67.39Original price $ 67.39 - Original price $ 67.39Original price $ 67.39Current price $ 53.89$ 53.89 - $ 53.89Current price $ 53.89
Foster 3603S/S, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 67.39Original price $ 67.39 - Original price $ 67.39Original price $ 67.39Current price $ 53.89$ 53.89 - $ 53.89Current price $ 53.89Save 20% -
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 FM1513, 3 Series, Industrial Coupler, Automatic, 1/4" Push-On Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1513 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 $ 22.29Original price $ 22.29 - Original price $ 22.29Original price $ 22.29Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79
Foster 3303GS, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 22.29Original price $ 22.29 - Original price $ 22.29Original price $ 22.29Current price $ 17.79$ 17.79 - $ 17.79Current price $ 17.79Save 20% -
Original price $ 25.69Original price $ 25.69 - Original price $ 25.69Original price $ 25.69Current price $ 20.49$ 20.49 - $ 20.49Current price $ 20.49
Foster 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 25.69Original price $ 25.69 - Original price $ 25.69Original price $ 25.69Current price $ 20.49$ 20.49 - $ 20.49Current price $ 20.49Save 20% -
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 $ 28.79Original price $ 28.79 - Original price $ 28.79Original price $ 28.79Current price $ 23.09$ 23.09 - $ 23.09Current price $ 23.09
Foster 3603GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 28.79Original price $ 28.79 - Original price $ 28.79Original price $ 28.79Current price $ 23.09$ 23.09 - $ 23.09Current price $ 23.09Save 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, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, 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 $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29
Foster FM2903, 3 Series, Industrial Coupler, Automatic, 1/8" Male NPT, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
View full detailsOriginal price $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29Save 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, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Push-On Hose Barb, 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 $ 21.49Original price $ 21.49 - Original price $ 21.49Original price $ 21.49Current price $ 17.19$ 17.19 - $ 17.19Current price $ 17.19
Foster SG2803, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Female NPT, 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 $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.09$ 14.09 - $ 14.09Current price $ 14.09
Foster SG2903, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Male NPT, 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 $ 15.99Original price $ 15.99 - Original price $ 15.99Original price $ 15.99Current price $ 12.79$ 12.79 - $ 12.79Current price $ 12.79
Foster 1513, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb (Push-On), Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 15.99Original price $ 15.99 - Original price $ 15.99Original price $ 15.99Current price $ 12.79$ 12.79 - $ 12.79Current price $ 12.79Save 20% -
Original price $ 17.09Original price $ 17.09 - Original price $ 17.09Original price $ 17.09Current price $ 13.69$ 13.69 - $ 13.69Current price $ 13.69
Foster 3653, 3 Series, Industrial Coupler, Manual, 5/16" Hose Barb, Brass, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 17.09Original price $ 17.09 - Original price $ 17.09Original price $ 17.09Current price $ 13.69$ 13.69 - $ 13.69Current price $ 13.69Save 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, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Stainless Steel
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 $ 44.59Original price $ 44.59 - Original price $ 44.59Original price $ 44.59Current price $ 35.69$ 35.69 - $ 35.69Current price $ 35.69
Foster 17-3S/S, 3 Series, Industrial Plug, 3/8" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 44.59Original price $ 44.59 - Original price $ 44.59Original price $ 44.59Current price $ 35.69$ 35.69 - $ 35.69Current price $ 35.69Save 20% -
Original price $ 9.79Original price $ 9.79 - Original price $ 9.79Original price $ 9.79Current price $ 7.79$ 7.79 - $ 7.79Current price $ 7.79
Foster 12S-3, 3 Series, Industrial Swivel Plug, 1/8" Male NPT, Steel, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 12S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 9.79Original price $ 9.79 - Original price $ 9.79Original price $ 9.79Current price $ 7.79$ 7.79 - $ 7.79Current price $ 7.79Save 20% -
Original price $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99
Foster 14S-3, 3 Series, Industrial Swivel Plug, 3/8" Male NPT, Steel, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 27.49Original price $ 27.49 - Original price $ 27.49Original price $ 27.49Current price $ 21.99$ 21.99 - $ 21.99Current price $ 21.99Save 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, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Stainless Steel
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 $ 68.79Original price $ 68.79 - Original price $ 68.79Original price $ 68.79Current price $ 55.09$ 55.09 - $ 55.09Current price $ 55.09
Foster 3703S/S, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Stainless Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...
View full detailsOriginal price $ 68.79Original price $ 68.79 - Original price $ 68.79Original price $ 68.79Current price $ 55.09$ 55.09 - $ 55.09Current price $ 55.09Save 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 FM3653, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3653 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...
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%
