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 $ 7.29Original price $ 7.29 - Original price $ 7.29Original price $ 7.29Current price $ 5.79$ 5.79 - $ 5.79Current price $ 5.79
Foster PB3-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3 is a Steel 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 $ 5.79$ 5.79 - $ 5.79Current price $ 5.79Save 21% -
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, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Free Swivel, Brass/Steel
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 $ 8.69Original price $ 8.69 - Original price $ 8.69Original price $ 8.69Current price $ 6.89$ 6.89 - $ 6.89Current price $ 6.89
Foster 10S-3, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Free Swivel, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...
View full detailsOriginal price $ 8.69Original price $ 8.69 - Original price $ 8.69Original price $ 8.69Current price $ 6.89$ 6.89 - $ 6.89Current price $ 6.89Save 21% -
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, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Free Swivel, Brass/Steel
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 $ 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, 1/4" Industrial Plug x 3/8" Push-On Hose Stem, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Push-On Hose Stem, 3 Series, 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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 303 Stainless
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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 5/16" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, 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 $ 11.59Original price $ 11.59 - Original price $ 11.59Original price $ 11.59Current price $ 9.29$ 9.29 - $ 9.29Current price $ 9.29
Foster 14-3GB, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Ball Check, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3GB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 11.59Original price $ 11.59 - Original price $ 11.59Original price $ 11.59Current price $ 9.29$ 9.29 - $ 9.29Current price $ 9.29Save 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, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, 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% -
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, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, 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 $ 11.39Original price $ 11.39 - Original price $ 11.39Original price $ 11.39Current price $ 9.09$ 9.09 - $ 9.09Current price $ 9.09
Foster 10-3GS/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GS/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...
View full detailsOriginal price $ 11.39Original price $ 11.39 - Original price $ 11.39Original price $ 11.39Current price $ 9.09$ 9.09 - $ 9.09Current price $ 9.09Save 20% -
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 10-3GS, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GS 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 $ 6.89Original price $ 6.89 - Original price $ 6.89Original price $ 6.89Current price $ 5.59$ 5.59 - $ 5.59Current price $ 5.59
Foster 10-3GB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
View full detailsOriginal price $ 6.89Original price $ 6.89 - Original price $ 6.89Original price $ 6.89Current price $ 5.59$ 5.59 - $ 5.59Current price $ 5.59Save 19% -
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 10-3G, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3G is a Steel 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 $ 17.29Original price $ 17.29 - Original price $ 17.29Original price $ 17.29Current price $ 13.89$ 13.89 - $ 13.89Current price $ 13.89
Foster 10-3DB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Brass
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3DB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...
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 $ 12.59Original price $ 12.59 - Original price $ 12.59Original price $ 12.59Current price $ 10.09$ 10.09 - $ 10.09Current price $ 10.09
Foster 10-3D, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3D is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...
View full detailsOriginal price $ 12.59Original price $ 12.59 - Original price $ 12.59Original price $ 12.59Current price $ 10.09$ 10.09 - $ 10.09Current price $ 10.09Save 20% -
Original price $ 9.49Original price $ 9.49 - Original price $ 9.49Original price $ 9.49Current price $ 7.59$ 7.59 - $ 7.59Current price $ 7.59
Foster 10-3S/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...
View full detailsOriginal price $ 9.49Original price $ 9.49 - Original price $ 9.49Original price $ 9.49Current price $ 7.59$ 7.59 - $ 7.59Current price $ 7.59Save 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, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 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 $ 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, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 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%
