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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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$ 268.00
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$ 214.00
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$ 214.00

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

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

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$ 268.00
$ 268.00 - $ 268.00
$ 268.00
$ 214.00
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$ 214.00
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$ 43.00
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$ 43.00
$ 34.00
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$ 34.00

Foster 10-3, 3 Series, Industrial Plug, 1/4" Male NPT, Steel

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

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$ 43.00
$ 43.00 - $ 43.00
$ 43.00
$ 34.00
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$ 34.00
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$ 68.00
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$ 68.00
$ 56.00
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$ 56.00

Foster 10-3B, 3 Series, Industrial Plug, 1/4" Male NPT, Brass

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

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$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 56.00
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$ 56.00
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$ 243.00
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$ 243.00
$ 195.00
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$ 195.00

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

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

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$ 243.00
$ 243.00 - $ 243.00
$ 243.00
$ 195.00
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$ 195.00
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$ 48.00
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$ 48.00
$ 40.00
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$ 40.00

Foster 11-3, 3 Series, Industrial Plug, 1/4" Female NPT, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 48.00
$ 48.00 - $ 48.00
$ 48.00
$ 40.00
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$ 40.00
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$ 52.00
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$ 52.00
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$ 41.00

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

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

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$ 52.00
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$ 52.00
$ 41.00
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$ 41.00
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$ 61.00
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$ 61.00
$ 48.00
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$ 48.00

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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$ 61.00
$ 61.00 - $ 61.00
$ 61.00
$ 48.00
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$ 48.00
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$ 86.00
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$ 86.00
$ 68.00
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$ 68.00

Foster 11-3B, 3 Series, Industrial Plug, 1/4" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 86.00
$ 86.00 - $ 86.00
$ 86.00
$ 68.00
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$ 68.00
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$ 393.00
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$ 393.00
$ 314.00
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$ 314.00

Foster FM3103, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 393.00
$ 393.00 - $ 393.00
$ 393.00
$ 314.00
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$ 314.00
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$ 419.00
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$ 419.00
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$ 335.00

Foster 3003GB, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass

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

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$ 419.00
$ 419.00 - $ 419.00
$ 419.00
$ 335.00
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$ 335.00
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$ 232.00
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$ 232.00
$ 186.00
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$ 186.00

Foster SG3103, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 232.00
$ 232.00 - $ 232.00
$ 232.00
$ 186.00
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$ 186.00
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$ 100.00
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$ 100.00
$ 81.00
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$ 81.00

Foster 13-3B, 3 Series, Industrial Plug, 1/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 100.00
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$ 100.00
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$ 81.00
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$ 130.00
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$ 130.00
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$ 106.00

Foster 17-3B, 3 Series, Industrial Plug, 3/8" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 130.00
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$ 130.00
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$ 106.00
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$ 384.00
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$ 384.00
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$ 307.00

Foster 3003GS, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass, Steel

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

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$ 384.00
$ 384.00 - $ 384.00
$ 384.00
$ 307.00
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$ 307.00
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$ 68.00
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$ 68.00
$ 54.00
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$ 54.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 54.00
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$ 54.00
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$ 257.00
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$ 257.00
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$ 205.00

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

Reliable, 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...

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$ 257.00
$ 257.00 - $ 257.00
$ 257.00
$ 205.00
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$ 205.00
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$ 396.00
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$ 396.00
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$ 318.00

Foster FM3203, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 396.00
$ 396.00 - $ 396.00
$ 396.00
$ 318.00
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$ 318.00
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$ 230.00
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$ 230.00
$ 184.00
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$ 184.00

Foster SG3003, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Female NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 230.00
$ 230.00 - $ 230.00
$ 230.00
$ 184.00
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$ 184.00
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$ 268.00
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$ 268.00
$ 214.00
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$ 214.00

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

Reliable, 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...

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$ 268.00
$ 268.00 - $ 268.00
$ 268.00
$ 214.00
$ 214.00 - $ 214.00
$ 214.00
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$ 280.00
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$ 280.00
$ 225.00
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$ 225.00

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

Reliable, 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...

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$ 280.00
$ 280.00 - $ 280.00
$ 280.00
$ 225.00
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$ 225.00
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$ 355.00
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$ 355.00
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$ 284.00

Foster 3003HW, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Brass (HOT WATER)

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

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$ 355.00
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$ 355.00
$ 284.00
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$ 284.00
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$ 400.00
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$ 400.00
$ 319.00
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$ 319.00

Foster FM3303, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 400.00
$ 400.00 - $ 400.00
$ 400.00
$ 319.00
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$ 319.00
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$ 241.00
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$ 241.00
$ 193.00
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$ 193.00

Foster SG3603, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 241.00
$ 241.00 - $ 241.00
$ 241.00
$ 193.00
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$ 193.00
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$ 59.00
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$ 59.00
$ 47.00
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$ 47.00

Foster 13-3, 3 Series, Industrial Plug, 1/8" Female NPT, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3 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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