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 $ 15.69Original price $ 15.69 - Original price $ 15.69Original price $ 15.69Current price $ 12.59$ 12.59 - $ 12.59Current price $ 12.59
Foster 3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, 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 $ 17.49Original price $ 17.49 - Original price $ 17.49Original price $ 17.49Current price $ 13.99$ 13.99 - $ 13.99Current price $ 13.99
Foster BL3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 17.49Original price $ 17.49 - Original price $ 17.49Original price $ 17.49Current price $ 13.99$ 13.99 - $ 13.99Current price $ 13.99Save 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, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, 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 $ 17.69Original price $ 17.69 - Original price $ 17.69Original price $ 17.69Current price $ 14.19$ 14.19 - $ 14.19Current price $ 14.19
Foster 3603W, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
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% -
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, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, 303 Stainless
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 $ 18.19Original price $ 18.19 - Original price $ 18.19Original price $ 18.19Current price $ 14.59$ 14.59 - $ 14.59Current price $ 14.59
Foster 3603S, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Steam/EPDM, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 18.19Original price $ 18.19 - Original price $ 18.19Original price $ 18.19Current price $ 14.59$ 14.59 - $ 14.59Current price $ 14.59Save 20% -
Original price $ 16.29Original price $ 16.29 - Original price $ 16.29Original price $ 16.29Current price $ 12.99$ 12.99 - $ 12.99Current price $ 12.99
Foster BL3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3603 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 16.29Original price $ 16.29 - Original price $ 16.29Original price $ 16.29Current price $ 12.99$ 12.99 - $ 12.99Current price $ 12.99Save 20% -
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, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, 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 $ 20.19Original price $ 20.19 - Original price $ 20.19Original price $ 20.19Current price $ 16.09$ 16.09 - $ 16.09Current price $ 16.09
Foster 1713W, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 20.19Original price $ 20.19 - Original price $ 20.19Original price $ 20.19Current price $ 16.09$ 16.09 - $ 16.09Current price $ 16.09Save 20% -
Original price $ 18.59Original price $ 18.59 - Original price $ 18.59Original price $ 18.59Current price $ 14.89$ 14.89 - $ 14.89Current price $ 14.89
Foster BL1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL1713 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 18.59Original price $ 18.59 - Original price $ 18.59Original price $ 18.59Current price $ 14.89$ 14.89 - $ 14.89Current price $ 14.89Save 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, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, 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 $ 20.29Original price $ 20.29 - Original price $ 20.29Original price $ 20.29Current price $ 16.29$ 16.29 - $ 16.29Current price $ 16.29
Foster 1513W, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 20.29Original price $ 20.29 - Original price $ 20.29Original price $ 20.29Current price $ 16.29$ 16.29 - $ 16.29Current price $ 16.29Save 20% -
Original price $ 18.19Original price $ 18.19 - Original price $ 18.19Original price $ 18.19Current price $ 14.59$ 14.59 - $ 14.59Current price $ 14.59
Foster BL1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 18.19Original price $ 18.19 - Original price $ 18.19Original price $ 18.19Current price $ 14.59$ 14.59 - $ 14.59Current price $ 14.59Save 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, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, 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 $ 18.69Original price $ 18.69 - Original price $ 18.69Original price $ 18.69Current price $ 14.99$ 14.99 - $ 14.99Current price $ 14.99
Foster 3303W, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 18.69Original price $ 18.69 - Original price $ 18.69Original price $ 18.69Current price $ 14.99$ 14.99 - $ 14.99Current price $ 14.99Save 20% -
Original price $ 70.79Original price $ 70.79 - Original price $ 70.79Original price $ 70.79Current price $ 56.59$ 56.59 - $ 56.59Current price $ 56.59
Foster BL3303S/S, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Ball Lock, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3303S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 70.79Original price $ 70.79 - Original price $ 70.79Original price $ 70.79Current price $ 56.59$ 56.59 - $ 56.59Current price $ 56.59Save 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, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, 303 Stainless
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 $ 17.09Original price $ 17.09 - Original price $ 17.09Original price $ 17.09Current price $ 13.69$ 13.69 - $ 13.69Current price $ 13.69
Foster 3303H, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Heat/Viton, Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...
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 $ 16.99Original price $ 16.99 - Original price $ 16.99Original price $ 16.99Current price $ 13.59$ 13.59 - $ 13.59Current price $ 13.59
Foster BL3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Ball Lock, Brass/Steel
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3303 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...
View full detailsOriginal price $ 16.99Original price $ 16.99 - Original price $ 16.99Original price $ 16.99Current price $ 13.59$ 13.59 - $ 13.59Current price $ 13.59Save 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, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, 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 $ 21.19Original price $ 21.19 - Original price $ 21.19Original price $ 21.19Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89
Foster BL3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...
View full detailsOriginal price $ 21.19Original price $ 21.19 - Original price $ 21.19Original price $ 21.19Current price $ 16.89$ 16.89 - $ 16.89Current price $ 16.89Save 20% -
Original price $ 17.49Original price $ 17.49 - Original price $ 17.49Original price $ 17.49Current price $ 13.99$ 13.99 - $ 13.99Current price $ 13.99
Foster 3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Water, Brass/SS
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...
View full detailsOriginal price $ 17.49Original price $ 17.49 - Original price $ 17.49Original price $ 17.49Current price $ 13.99$ 13.99 - $ 13.99Current price $ 13.99Save 20% -
Original price $ 45.29Original price $ 45.29 - Original price $ 45.29Original price $ 45.29Current price $ 36.29$ 36.29 - $ 36.29Current price $ 36.29
Foster 3103S/SLV, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Less Valve, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/SLV is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...
View full detailsOriginal price $ 45.29Original price $ 45.29 - Original price $ 45.29Original price $ 45.29Current price $ 36.29$ 36.29 - $ 36.29Current price $ 36.29Save 20% -
Original price $ 47.59Original price $ 47.59 - Original price $ 47.59Original price $ 47.59Current price $ 38.09$ 38.09 - $ 38.09Current price $ 38.09
Foster 3103S/SH, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Heat/Viton, 303 Stainless
In stockReliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/SH is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...
View full detailsOriginal price $ 47.59Original price $ 47.59 - Original price $ 47.59Original price $ 47.59Current price $ 38.09$ 38.09 - $ 38.09Current price $ 38.09Save 20%
