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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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$ 178.00
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$ 178.00
$ 142.00
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$ 142.00

Foster 14-3B, 3 Series, Industrial Plug, 3/8" Male NPT, Brass

Reliable, 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 ...

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$ 178.00
$ 178.00 - $ 178.00
$ 178.00
$ 142.00
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$ 142.00
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$ 237.00
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$ 237.00
$ 189.00
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$ 189.00

Foster 12-3S/S, 3 Series, Industrial Plug, 1/8" Male NPT, Stainless Steel

Reliable, 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 —...

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$ 237.00
$ 237.00 - $ 237.00
$ 237.00
$ 189.00
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$ 189.00
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$ 363.00
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$ 363.00
$ 290.00
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$ 290.00

Foster 2803, 3 Series, Industrial Coupler, Manual, 1/8" Female NPT, Brass, Steel

Reliable, 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...

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$ 363.00
$ 363.00 - $ 363.00
$ 363.00
$ 290.00
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$ 290.00
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$ 310.00
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$ 310.00
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$ 250.00

Foster 2903, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, Brass, Steel

Reliable, 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...

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$ 310.00
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$ 310.00
$ 250.00
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$ 250.00
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$ 1,274.00
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$ 1,274.00
$ 1,019.00
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$ 1,019.00

Foster 3603S/S, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Stainless Steel

Reliable, 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...

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$ 1,274.00
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$ 1,274.00
$ 1,019.00
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$ 1,019.00
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$ 405.00
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$ 405.00
$ 324.00
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$ 324.00

Foster FM1513, 3 Series, Industrial Coupler, Automatic, 1/4" Push-On Hose Barb, Brass

Reliable, 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...

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$ 405.00
$ 405.00 - $ 405.00
$ 405.00
$ 324.00
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$ 324.00
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$ 422.00
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$ 422.00
$ 337.00
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$ 337.00

Foster 3303GS, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass, Steel

Reliable, 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...

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$ 422.00
$ 422.00 - $ 422.00
$ 422.00
$ 337.00
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$ 337.00
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$ 486.00
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$ 486.00
$ 388.00
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$ 388.00

Foster 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass

Reliable, 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...

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$ 486.00
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$ 486.00
$ 388.00
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$ 388.00
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$ 65.00
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$ 65.00
$ 51.00
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$ 51.00

Foster 16-3, 3 Series, Industrial Plug, 1/4" Hose Barb, Steel

Reliable, 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...

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$ 65.00
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$ 65.00
$ 51.00
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$ 51.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 138.00
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$ 138.00
$ 110.00
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$ 110.00

Foster PB3-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Steel

Reliable, 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 ...

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$ 138.00
$ 138.00 - $ 138.00
$ 138.00
$ 110.00
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$ 110.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 238.00
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$ 238.00
$ 191.00
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$ 191.00

Foster 10-3D, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Steel

Reliable, 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 ...

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$ 238.00
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$ 238.00
$ 191.00
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$ 191.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 265.00
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$ 265.00
$ 212.00
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$ 212.00

Foster 3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Dill Valve, Brass/Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103D is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...

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$ 265.00
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$ 265.00
$ 212.00
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$ 212.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 316.00
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$ 316.00
$ 252.00
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$ 252.00

Foster 3003H, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Heat/Viton, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...

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$ 316.00
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$ 316.00
$ 252.00
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$ 252.00
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$ 545.00
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$ 545.00
$ 437.00
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$ 437.00

Foster 3603GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass

Reliable, 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...

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$ 545.00
$ 545.00 - $ 545.00
$ 545.00
$ 437.00
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$ 437.00
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$ 282.00
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$ 282.00
$ 225.00
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$ 225.00

Foster SG1513, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Push-On Hose Barb, Brass

Reliable, 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...

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$ 282.00
$ 282.00 - $ 282.00
$ 282.00
$ 225.00
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$ 225.00
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$ 407.00
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$ 407.00
$ 325.00
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$ 325.00

Foster SG2803, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Female NPT, Brass

Reliable, 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...

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$ 407.00
$ 407.00 - $ 407.00
$ 407.00
$ 325.00
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$ 325.00
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$ 335.00
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$ 335.00
$ 267.00
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$ 267.00

Foster SG2903, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Male NPT, Brass

Reliable, 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...

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$ 335.00
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$ 335.00
$ 267.00
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$ 267.00
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$ 303.00
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$ 303.00
$ 242.00
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$ 242.00

Foster 1513, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb (Push-On), Brass, Steel

Reliable, 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...

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$ 303.00
$ 303.00 - $ 303.00
$ 303.00
$ 242.00
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$ 242.00
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$ 324.00
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$ 324.00
$ 259.00
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$ 259.00

Foster 3653, 3 Series, Industrial Coupler, Manual, 5/16" Hose Barb, Brass, Steel

Reliable, 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...

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$ 324.00
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$ 324.00
$ 259.00
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$ 259.00
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$ 851.00
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$ 851.00
$ 681.00
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$ 681.00

Foster 3103S/S, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Stainless Steel

Reliable, 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...

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$ 851.00
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$ 851.00
$ 681.00
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$ 681.00
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$ 843.00
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$ 843.00
$ 675.00
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$ 675.00

Foster 17-3S/S, 3 Series, Industrial Plug, 3/8" Hose Barb, Stainless Steel

Reliable, 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 —...

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$ 843.00
$ 843.00 - $ 843.00
$ 843.00
$ 675.00
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$ 675.00
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$ 186.00
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$ 186.00
$ 148.00
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$ 148.00

Foster 12S-3, 3 Series, Industrial Swivel Plug, 1/8" Male NPT, Steel, Brass

Reliable, 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...

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$ 186.00
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$ 186.00
$ 148.00
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$ 148.00
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$ 520.00
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$ 520.00
$ 416.00
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$ 416.00

Foster 14S-3, 3 Series, Industrial Swivel Plug, 3/8" Male NPT, Steel, Brass

Reliable, 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...

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$ 520.00
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$ 520.00
$ 416.00
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$ 416.00
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$ 1,255.00
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$ 1,004.00
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$ 1,004.00

Foster 3203S/S, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Stainless Steel

Reliable, 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...

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$ 1,255.00
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$ 1,255.00
$ 1,004.00
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$ 1,004.00
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