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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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$ 152.00
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$ 152.00
$ 121.00
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$ 121.00

Foster 165-3, 3 Series, Industrial Plug, 5/16" Hose Barb, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 165-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 152.00
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$ 152.00
$ 121.00
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$ 121.00
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$ 403.00
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$ 403.00
$ 322.00
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$ 322.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 403.00
$ 403.00 - $ 403.00
$ 403.00
$ 322.00
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$ 322.00
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$ 269.00
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$ 269.00
$ 216.00
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$ 216.00

Foster SG1713, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Push-On Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 269.00
$ 269.00 - $ 269.00
$ 269.00
$ 216.00
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$ 216.00
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$ 82.00
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$ 82.00
$ 66.00
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$ 66.00

Foster 71-3, 3 Series, Industrial Plug, 3/8" Hose Barb (Push-On), Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 71-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 82.00
$ 82.00 - $ 82.00
$ 82.00
$ 66.00
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$ 66.00
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$ 1,173.00
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$ 1,173.00
$ 938.00
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$ 938.00

Foster 3303S/S, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Stainless Steel

Reliable, 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...

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$ 1,173.00
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$ 1,173.00
$ 938.00
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$ 938.00
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$ 520.00
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$ 520.00
$ 417.00
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$ 417.00

Foster 3203GB, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 520.00
$ 520.00 - $ 520.00
$ 520.00
$ 417.00
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$ 417.00
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$ 404.00
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$ 404.00
$ 324.00
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$ 324.00

Foster SL3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass With Ball Sleeve Lock

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003 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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$ 143.00
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$ 143.00
$ 114.00
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$ 114.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 143.00
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$ 143.00
$ 114.00
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$ 114.00
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$ 248.00
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$ 248.00
$ 198.00
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$ 198.00

Foster SG3203, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 248.00
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$ 248.00
$ 198.00
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$ 198.00
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$ 251.00
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$ 251.00
$ 200.00
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$ 200.00

Foster SG3303, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 251.00
$ 251.00 - $ 251.00
$ 251.00
$ 200.00
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$ 200.00
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$ 789.00
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$ 789.00
$ 630.00
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$ 630.00

Foster 3003S/S, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Stainless Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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$ 789.00
$ 789.00 - $ 789.00
$ 789.00
$ 630.00
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$ 630.00
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$ 89.00
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$ 89.00
$ 72.00
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$ 72.00

Foster 12-3B, 3 Series, Industrial Plug, 1/8" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 89.00
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$ 89.00
$ 72.00
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$ 72.00
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$ 475.00
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$ 475.00
$ 381.00
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$ 381.00

Foster 3103GB, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass

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

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$ 475.00
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$ 475.00
$ 381.00
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$ 381.00
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$ 529.00
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$ 529.00
$ 422.00
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$ 422.00

Foster 3703GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 529.00
$ 529.00 - $ 529.00
$ 529.00
$ 422.00
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$ 422.00
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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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$ 308.00
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$ 308.00
$ 248.00
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$ 248.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3DB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...

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$ 308.00
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$ 308.00
$ 248.00
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$ 248.00
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$ 68.00
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$ 68.00
$ 54.00
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$ 54.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 68.00
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$ 68.00
$ 54.00
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$ 54.00
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$ 271.00
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$ 271.00
$ 217.00
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$ 217.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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$ 271.00
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$ 271.00
$ 217.00
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$ 217.00
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$ 104.00
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$ 104.00
$ 82.00
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$ 82.00

Foster 15-3, 3 Series, Industrial Plug, 3/8" Female NPT, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 104.00
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$ 104.00
$ 82.00
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$ 82.00
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$ 406.00
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$ 406.00
$ 326.00
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$ 326.00

Foster FM3603, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 406.00
$ 406.00 - $ 406.00
$ 406.00
$ 326.00
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$ 326.00
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$ 420.00
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$ 420.00
$ 337.00
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$ 337.00

Foster FM3703, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 420.00
$ 420.00 - $ 420.00
$ 420.00
$ 337.00
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$ 337.00
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$ 242.00
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$ 242.00
$ 194.00
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$ 194.00

Foster SG3703, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 242.00
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$ 242.00
$ 194.00
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$ 194.00
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$ 289.00
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$ 289.00
$ 230.00
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$ 230.00

Foster 1713, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb (Push-On), Brass, Steel

Reliable, 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...

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$ 289.00
$ 289.00 - $ 289.00
$ 289.00
$ 230.00
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$ 230.00
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$ 168.00
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$ 168.00
$ 134.00
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$ 134.00

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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$ 168.00
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$ 168.00
$ 134.00
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$ 134.00
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$ 93.00
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$ 93.00
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$ 73.00

Foster 51-3, 3 Series, Industrial Plug, 1/4" Hose Barb (Push-On), Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 51-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 93.00
$ 93.00 - $ 93.00
$ 93.00
$ 73.00
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$ 73.00
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