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 $ 281.00Original price $ 281.00 - Original price $ 281.00Original price $ 281.00Current price $ 225.00$ 225.00 - $ 225.00Current price $ 225.00
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 $ 281.00Original price $ 281.00 - Original price $ 281.00Original price $ 281.00Current price $ 225.00$ 225.00 - $ 225.00Current price $ 225.00Save 20% -
Original price $ 313.00Original price $ 313.00 - Original price $ 313.00Original price $ 313.00Current price $ 250.00$ 250.00 - $ 250.00Current price $ 250.00
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 $ 313.00Original price $ 313.00 - Original price $ 313.00Original price $ 313.00Current price $ 250.00$ 250.00 - $ 250.00Current price $ 250.00Save 20% -
Original price $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00
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 $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00Save 20% -
Original price $ 317.00Original price $ 317.00 - Original price $ 317.00Original price $ 317.00Current price $ 254.00$ 254.00 - $ 254.00Current price $ 254.00
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 $ 317.00Original price $ 317.00 - Original price $ 317.00Original price $ 317.00Current price $ 254.00$ 254.00 - $ 254.00Current price $ 254.00Save 20% -
Original price $ 1,205.00Original price $ 1,205.00 - Original price $ 1,205.00Original price $ 1,205.00Current price $ 963.00$ 963.00 - $ 963.00Current price $ 963.00
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 $ 1,205.00Original price $ 1,205.00 - Original price $ 1,205.00Original price $ 1,205.00Current price $ 963.00$ 963.00 - $ 963.00Current price $ 963.00Save 20% -
Original price $ 326.00Original price $ 326.00 - Original price $ 326.00Original price $ 326.00Current price $ 261.00$ 261.00 - $ 261.00Current price $ 261.00
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 $ 326.00Original price $ 326.00 - Original price $ 326.00Original price $ 326.00Current price $ 261.00$ 261.00 - $ 261.00Current price $ 261.00Save 20% -
Original price $ 292.00Original price $ 292.00 - Original price $ 292.00Original price $ 292.00Current price $ 233.00$ 233.00 - $ 233.00Current price $ 233.00
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 $ 292.00Original price $ 292.00 - Original price $ 292.00Original price $ 292.00Current price $ 233.00$ 233.00 - $ 233.00Current price $ 233.00Save 20% -
Original price $ 258.00Original price $ 258.00 - Original price $ 258.00Original price $ 258.00Current price $ 206.00$ 206.00 - $ 206.00Current price $ 206.00
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 $ 258.00Original price $ 258.00 - Original price $ 258.00Original price $ 258.00Current price $ 206.00$ 206.00 - $ 206.00Current price $ 206.00Save 20% -
Original price $ 361.00Original price $ 361.00 - Original price $ 361.00Original price $ 361.00Current price $ 288.00$ 288.00 - $ 288.00Current price $ 288.00
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 $ 361.00Original price $ 361.00 - Original price $ 361.00Original price $ 361.00Current price $ 288.00$ 288.00 - $ 288.00Current price $ 288.00Save 20% -
Original price $ 333.00Original price $ 333.00 - Original price $ 333.00Original price $ 333.00Current price $ 267.00$ 267.00 - $ 267.00Current price $ 267.00
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 $ 333.00Original price $ 333.00 - Original price $ 333.00Original price $ 333.00Current price $ 267.00$ 267.00 - $ 267.00Current price $ 267.00Save 20% -
Original price $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00
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 $ 290.00Original price $ 290.00 - Original price $ 290.00Original price $ 290.00Current price $ 231.00$ 231.00 - $ 231.00Current price $ 231.00Save 20% -
Original price $ 363.00Original price $ 363.00 - Original price $ 363.00Original price $ 363.00Current price $ 292.00$ 292.00 - $ 292.00Current price $ 292.00
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 $ 363.00Original price $ 363.00 - Original price $ 363.00Original price $ 363.00Current price $ 292.00$ 292.00 - $ 292.00Current price $ 292.00Save 20% -
Original price $ 326.00Original price $ 326.00 - Original price $ 326.00Original price $ 326.00Current price $ 261.00$ 261.00 - $ 261.00Current price $ 261.00
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 $ 326.00Original price $ 326.00 - Original price $ 326.00Original price $ 326.00Current price $ 261.00$ 261.00 - $ 261.00Current price $ 261.00Save 20% -
Original price $ 286.00Original price $ 286.00 - Original price $ 286.00Original price $ 286.00Current price $ 229.00$ 229.00 - $ 229.00Current price $ 229.00
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 $ 286.00Original price $ 286.00 - Original price $ 286.00Original price $ 286.00Current price $ 229.00$ 229.00 - $ 229.00Current price $ 229.00Save 20% -
Original price $ 334.00Original price $ 334.00 - Original price $ 334.00Original price $ 334.00Current price $ 268.00$ 268.00 - $ 268.00Current price $ 268.00
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 $ 334.00Original price $ 334.00 - Original price $ 334.00Original price $ 334.00Current price $ 268.00$ 268.00 - $ 268.00Current price $ 268.00Save 20% -
Original price $ 1,265.00Original price $ 1,265.00 - Original price $ 1,265.00Original price $ 1,265.00Current price $ 1,012.00$ 1,012.00 - $ 1,012.00Current price $ 1,012.00
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 $ 1,265.00Original price $ 1,265.00 - Original price $ 1,265.00Original price $ 1,265.00Current price $ 1,012.00$ 1,012.00 - $ 1,012.00Current price $ 1,012.00Save 20% -
Original price $ 1,178.00Original price $ 1,178.00 - Original price $ 1,178.00Original price $ 1,178.00Current price $ 942.00$ 942.00 - $ 942.00Current price $ 942.00
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 $ 1,178.00Original price $ 1,178.00 - Original price $ 1,178.00Original price $ 1,178.00Current price $ 942.00$ 942.00 - $ 942.00Current price $ 942.00Save 20% -
Original price $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00
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 $ 306.00Original price $ 306.00 - Original price $ 306.00Original price $ 306.00Current price $ 245.00$ 245.00 - $ 245.00Current price $ 245.00Save 20% -
Original price $ 304.00Original price $ 304.00 - Original price $ 304.00Original price $ 304.00Current price $ 243.00$ 243.00 - $ 243.00Current price $ 243.00
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 $ 304.00Original price $ 304.00 - Original price $ 304.00Original price $ 304.00Current price $ 243.00$ 243.00 - $ 243.00Current price $ 243.00Save 20% -
Original price $ 268.00Original price $ 268.00 - Original price $ 268.00Original price $ 268.00Current price $ 215.00$ 215.00 - $ 215.00Current price $ 215.00
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 $ 268.00Original price $ 268.00 - Original price $ 268.00Original price $ 268.00Current price $ 215.00$ 215.00 - $ 215.00Current price $ 215.00Save 20% -
Original price $ 379.00Original price $ 379.00 - Original price $ 379.00Original price $ 379.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00
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 $ 379.00Original price $ 379.00 - Original price $ 379.00Original price $ 379.00Current price $ 302.00$ 302.00 - $ 302.00Current price $ 302.00Save 20% -
Original price $ 313.00Original price $ 313.00 - Original price $ 313.00Original price $ 313.00Current price $ 250.00$ 250.00 - $ 250.00Current price $ 250.00
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 $ 313.00Original price $ 313.00 - Original price $ 313.00Original price $ 313.00Current price $ 250.00$ 250.00 - $ 250.00Current price $ 250.00Save 20% -
Original price $ 810.00Original price $ 810.00 - Original price $ 810.00Original price $ 810.00Current price $ 649.00$ 649.00 - $ 649.00Current price $ 649.00
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 $ 810.00Original price $ 810.00 - Original price $ 810.00Original price $ 810.00Current price $ 649.00$ 649.00 - $ 649.00Current price $ 649.00Save 20% -
Original price $ 851.00Original price $ 851.00 - Original price $ 851.00Original price $ 851.00Current price $ 681.00$ 681.00 - $ 681.00Current price $ 681.00
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 $ 851.00Original price $ 851.00 - Original price $ 851.00Original price $ 851.00Current price $ 681.00$ 681.00 - $ 681.00Current price $ 681.00Save 20%
