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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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$ 334.00
$ 334.00 - $ 334.00
$ 334.00
$ 266.00
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$ 266.00

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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$ 334.00
$ 334.00 - $ 334.00
$ 334.00
$ 266.00
$ 266.00 - $ 266.00
$ 266.00
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$ 286.00
$ 286.00 - $ 286.00
$ 286.00
$ 230.00
$ 230.00 - $ 230.00
$ 230.00

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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$ 286.00
$ 286.00 - $ 286.00
$ 286.00
$ 230.00
$ 230.00 - $ 230.00
$ 230.00
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$ 1,172.00
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$ 1,172.00
$ 938.00
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$ 938.00

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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$ 1,172.00
$ 1,172.00 - $ 1,172.00
$ 1,172.00
$ 938.00
$ 938.00 - $ 938.00
$ 938.00
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$ 372.00
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$ 372.00
$ 298.00
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$ 298.00

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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$ 372.00
$ 372.00 - $ 372.00
$ 372.00
$ 298.00
$ 298.00 - $ 298.00
$ 298.00
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$ 388.00
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$ 388.00
$ 310.00
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$ 310.00

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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$ 388.00
$ 388.00 - $ 388.00
$ 388.00
$ 310.00
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$ 310.00
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$ 447.00
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$ 447.00
$ 357.00
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$ 357.00

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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$ 447.00
$ 447.00 - $ 447.00
$ 447.00
$ 357.00
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$ 357.00
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$ 59.00
$ 59.00 - $ 59.00
$ 59.00
$ 47.00
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$ 47.00

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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$ 59.00
$ 59.00 - $ 59.00
$ 59.00
$ 47.00
$ 47.00 - $ 47.00
$ 47.00
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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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$ 127.00
$ 127.00 - $ 127.00
$ 127.00
$ 101.00
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$ 101.00

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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$ 127.00
$ 127.00 - $ 127.00
$ 127.00
$ 101.00
$ 101.00 - $ 101.00
$ 101.00
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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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$ 345.00
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$ 345.00
$ 277.00
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$ 277.00

Foster SB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Brass/Steel

Reliable, 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 — ...

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$ 345.00
$ 345.00 - $ 345.00
$ 345.00
$ 277.00
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$ 277.00
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$ 501.00
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$ 501.00
$ 402.00
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$ 402.00

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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$ 501.00
$ 501.00 - $ 501.00
$ 501.00
$ 402.00
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$ 402.00
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$ 259.00
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$ 259.00
$ 207.00
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$ 207.00

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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$ 259.00
$ 259.00 - $ 259.00
$ 259.00
$ 207.00
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$ 207.00
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$ 374.00
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$ 374.00
$ 299.00
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$ 299.00

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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$ 374.00
$ 374.00 - $ 374.00
$ 374.00
$ 299.00
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$ 299.00
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$ 308.00
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$ 308.00
$ 246.00
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$ 246.00

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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$ 308.00
$ 308.00 - $ 308.00
$ 308.00
$ 246.00
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$ 246.00
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$ 279.00
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$ 279.00
$ 223.00
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$ 223.00

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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$ 279.00
$ 279.00 - $ 279.00
$ 279.00
$ 223.00
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$ 223.00
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$ 298.00
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$ 298.00
$ 239.00
$ 239.00 - $ 239.00
$ 239.00

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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$ 298.00
$ 298.00 - $ 298.00
$ 298.00
$ 239.00
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$ 239.00
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$ 783.00
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$ 783.00
$ 626.00
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$ 626.00

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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$ 783.00
$ 783.00 - $ 783.00
$ 783.00
$ 626.00
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$ 626.00
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$ 776.00
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$ 776.00
$ 621.00
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$ 621.00

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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$ 776.00
$ 776.00 - $ 776.00
$ 776.00
$ 621.00
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$ 621.00
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$ 171.00
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$ 171.00
$ 136.00
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$ 136.00

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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$ 171.00
$ 171.00 - $ 171.00
$ 171.00
$ 136.00
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$ 136.00
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$ 479.00
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$ 479.00
$ 383.00
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$ 383.00

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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$ 479.00
$ 479.00 - $ 479.00
$ 479.00
$ 383.00
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$ 383.00
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$ 1,155.00
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$ 1,155.00
$ 924.00
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$ 924.00

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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$ 1,155.00
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$ 1,155.00
$ 924.00
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$ 924.00
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$ 1,197.00
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$ 1,197.00
$ 959.00
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$ 959.00

Foster 3703S/S, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Stainless Steel

Reliable, 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...

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$ 1,197.00
$ 1,197.00 - $ 1,197.00
$ 1,197.00
$ 959.00
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$ 959.00
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$ 404.00
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$ 404.00
$ 324.00
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$ 324.00

Foster FM3653, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3653 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 404.00
$ 404.00 - $ 404.00
$ 404.00
$ 324.00
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$ 324.00
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$ 517.00
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$ 517.00
$ 414.00
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$ 414.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 517.00
$ 517.00 - $ 517.00
$ 517.00
$ 414.00
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$ 414.00
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$ 286.00
$ 286.00 - $ 286.00
$ 286.00
$ 230.00
$ 230.00 - $ 230.00
$ 230.00

Foster 2903GS, 3 Series, Industrial Coupler, Automatic, 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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$ 286.00
$ 286.00 - $ 286.00
$ 286.00
$ 230.00
$ 230.00 - $ 230.00
$ 230.00
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