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 $ 21.59Original price $ 21.59 - Original price $ 21.59Original price $ 21.59Current price $ 17.29$ 17.29 - $ 17.29Current price $ 17.29
Foster BLSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
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 $ 20.29Original price $ 20.29 - Original price $ 20.29Original price $ 20.29Current price $ 16.19$ 16.19 - $ 16.19Current price $ 16.19
Foster SD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 20.29Original price $ 20.29 - Original price $ 20.29Original price $ 20.29Current price $ 16.19$ 16.19 - $ 16.19Current price $ 16.19Save 20% -
Original price $ 32.89Original price $ 32.89 - Original price $ 32.89Original price $ 32.89Current price $ 26.29$ 26.29 - $ 26.29Current price $ 26.29
Foster BLSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 32.89Original price $ 32.89 - Original price $ 32.89Original price $ 32.89Current price $ 26.29$ 26.29 - $ 26.29Current price $ 26.29Save 20% -
Original price $ 32.99Original price $ 32.99 - Original price $ 32.99Original price $ 32.99Current price $ 26.39$ 26.39 - $ 26.39Current price $ 26.39
Foster SC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 32.99Original price $ 32.99 - Original price $ 32.99Original price $ 32.99Current price $ 26.39$ 26.39 - $ 26.39Current price $ 26.39Save 20% -
Original price $ 32.49Original price $ 32.49 - Original price $ 32.49Original price $ 32.49Current price $ 25.99$ 25.99 - $ 25.99Current price $ 25.99
Foster BLSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSC5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 32.49Original price $ 32.49 - Original price $ 32.49Original price $ 32.49Current price $ 25.99$ 25.99 - $ 25.99Current price $ 25.99Save 20% -
Original price $ 32.59Original price $ 32.59 - Original price $ 32.59Original price $ 32.59Current price $ 26.09$ 26.09 - $ 26.09Current price $ 26.09
Foster SC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SC5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 32.59Original price $ 32.59 - Original price $ 32.59Original price $ 32.59Current price $ 26.09$ 26.09 - $ 26.09Current price $ 26.09Save 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 BLSB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
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 $ 22.99Original price $ 22.99 - Original price $ 22.99Original price $ 22.99Current price $ 18.39$ 18.39 - $ 18.39Current price $ 18.39
Foster SB7-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 22.99Original price $ 22.99 - Original price $ 22.99Original price $ 22.99Current price $ 18.39$ 18.39 - $ 18.39Current price $ 18.39Save 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 BLSB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Se...
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 $ 63.49Original price $ 63.49 - Original price $ 63.49Original price $ 63.49Current price $ 50.79$ 50.79 - $ 50.79Current price $ 50.79
Foster SB7-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 63.49Original price $ 63.49 - Original price $ 63.49Original price $ 63.49Current price $ 50.79$ 50.79 - $ 50.79Current price $ 50.79Save 20% -
Original price $ 21.09Original price $ 21.09 - Original price $ 21.09Original price $ 21.09Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89
Foster BLSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB7-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 21.09Original price $ 21.09 - Original price $ 21.09Original price $ 21.09Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89Save 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 SB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3 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 $ 28.39Original price $ 28.39 - Original price $ 28.39Original price $ 28.39Current price $ 22.69$ 22.69 - $ 22.69Current price $ 22.69
Foster BLSB5-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 28.39Original price $ 28.39 - Original price $ 28.39Original price $ 28.39Current price $ 22.69$ 22.69 - $ 22.69Current price $ 22.69Save 20% -
Original price $ 22.09Original price $ 22.09 - Original price $ 22.09Original price $ 22.09Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59
Foster BLSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...
View full detailsOriginal price $ 22.09Original price $ 22.09 - Original price $ 22.09Original price $ 22.09Current price $ 17.59$ 17.59 - $ 17.59Current price $ 17.59Save 20% -
Original price $ 21.09Original price $ 21.09 - Original price $ 21.09Original price $ 21.09Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89
Foster SB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 21.09Original price $ 21.09 - Original price $ 21.09Original price $ 21.09Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89Save 20% -
Original price $ 23.69Original price $ 23.69 - Original price $ 23.69Original price $ 23.69Current price $ 18.99$ 18.99 - $ 18.99Current price $ 18.99
Foster SB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...
View full detailsOriginal price $ 23.69Original price $ 23.69 - Original price $ 23.69Original price $ 23.69Current price $ 18.99$ 18.99 - $ 18.99Current price $ 18.99Save 20% -
Original price $ 109.79Original price $ 109.79 - Original price $ 109.79Original price $ 109.79Current price $ 87.89$ 87.89 - $ 87.89Current price $ 87.89
Foster SB3-3S/S, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 109.79Original price $ 109.79 - Original price $ 109.79Original price $ 109.79Current price $ 87.89$ 87.89 - $ 87.89Current price $ 87.89Save 20% -
Original price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99
Foster BLSB3-3W, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSB3-3W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 26.29Original price $ 26.29 - Original price $ 26.29Original price $ 26.29Current price $ 20.99$ 20.99 - $ 20.99Current price $ 20.99Save 20% -
Original price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.89$ 15.89 - $ 15.89Current price $ 15.89
Foster SB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...
View full detailsOriginal price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.89$ 15.89 - $ 15.89Current price $ 15.89Save 20% -
Original price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.79$ 15.79 - $ 15.79Current price $ 15.79
Foster 3703W, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 19.79Original price $ 19.79 - Original price $ 19.79Original price $ 19.79Current price $ 15.79$ 15.79 - $ 15.79Current price $ 15.79Save 20% -
Original price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79
Foster BL3703S/S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 72.29Original price $ 72.29 - Original price $ 72.29Original price $ 72.29Current price $ 57.79$ 57.79 - $ 57.79Current price $ 57.79Save 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, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, 303 Stainless
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 $ 19.59Original price $ 19.59 - Original price $ 19.59Original price $ 19.59Current price $ 15.69$ 15.69 - $ 15.69Current price $ 15.69
Foster 3703S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 19.59Original price $ 19.59 - Original price $ 19.59Original price $ 19.59Current price $ 15.69$ 15.69 - $ 15.69Current price $ 15.69Save 20% -
Original price $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.19$ 14.19 - $ 14.19Current price $ 14.19
Foster BL3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3703 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.19$ 14.19 - $ 14.19Current price $ 14.19Save 20%
