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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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$ 529.00
$ 529.00 - $ 529.00
$ 529.00
$ 424.00
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$ 424.00

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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$ 529.00
$ 529.00 - $ 529.00
$ 529.00
$ 424.00
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$ 424.00
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$ 292.00
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$ 292.00
$ 235.00
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$ 235.00

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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$ 292.00
$ 292.00 - $ 292.00
$ 292.00
$ 235.00
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$ 235.00
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$ 385.00
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$ 385.00
$ 309.00
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$ 309.00

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

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

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$ 385.00
$ 385.00 - $ 385.00
$ 385.00
$ 309.00
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$ 309.00
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$ 403.00
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$ 403.00
$ 323.00
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$ 323.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203GS 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
$ 323.00
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$ 323.00
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$ 496.00
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$ 496.00
$ 396.00
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$ 396.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 496.00
$ 496.00 - $ 496.00
$ 496.00
$ 396.00
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$ 396.00
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$ 405.00
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$ 405.00
$ 325.00
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$ 325.00

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

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

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$ 405.00
$ 405.00 - $ 405.00
$ 405.00
$ 325.00
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$ 325.00
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$ 503.00
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$ 503.00
$ 401.00
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$ 401.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 503.00
$ 503.00 - $ 503.00
$ 503.00
$ 401.00
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$ 401.00
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$ 506.00
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$ 506.00
$ 405.00
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$ 405.00

Foster 3653GB, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 506.00
$ 506.00 - $ 506.00
$ 506.00
$ 405.00
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$ 405.00
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$ 554.00
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$ 554.00
$ 444.00
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$ 444.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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$ 554.00
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$ 554.00
$ 444.00
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$ 444.00
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$ 289.00
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$ 289.00
$ 230.00
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$ 230.00

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

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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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 38.00
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$ 38.00
$ 31.00
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$ 31.00

Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic

Protect your 1/4" 3 Series quick plugs when not in use. The Foster 3PDC dust cap keeps dirt, chips, and moisture out of the coupling, helping preve...

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$ 38.00
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$ 38.00
$ 31.00
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$ 31.00
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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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$ 216.00
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$ 216.00
$ 173.00
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$ 173.00

Foster PD13-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PD13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most...

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$ 216.00
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$ 216.00
$ 173.00
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$ 173.00
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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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$ 187.00
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$ 187.00
$ 150.00
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$ 150.00

Foster PD11-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PD11-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most...

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$ 187.00
$ 187.00 - $ 187.00
$ 187.00
$ 150.00
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$ 150.00
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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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$ 171.00
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$ 171.00
$ 137.00
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$ 137.00

Foster PD9-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PD9-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 171.00
$ 171.00 - $ 171.00
$ 171.00
$ 137.00
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$ 137.00
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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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$ 164.00
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$ 164.00
$ 132.00
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$ 132.00

Foster PD7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PD7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 164.00
$ 164.00 - $ 164.00
$ 164.00
$ 132.00
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$ 132.00
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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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$ 586.00
$ 586.00 - $ 586.00
$ 586.00
$ 469.00
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$ 469.00

Foster PC7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PC7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 586.00
$ 586.00 - $ 586.00
$ 586.00
$ 469.00
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$ 469.00
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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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$ 346.00
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$ 346.00
$ 276.00
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$ 276.00

Foster PC5-3, 1/4" Industrial Plug x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PC5-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 346.00
$ 346.00 - $ 346.00
$ 346.00
$ 276.00
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$ 276.00
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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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$ 460.00
$ 460.00 - $ 460.00
$ 460.00
$ 367.00
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$ 367.00

Foster PB7-3S/S, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, 303 Stainless

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB7-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...

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$ 460.00
$ 460.00 - $ 460.00
$ 460.00
$ 367.00
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$ 367.00
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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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$ 252.00
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$ 252.00
$ 200.00
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$ 200.00

Foster PB7-3B, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB7-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...

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$ 252.00
$ 252.00 - $ 252.00
$ 252.00
$ 200.00
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$ 200.00
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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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$ 146.00
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$ 146.00
$ 118.00
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$ 118.00

Foster PB7-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB7-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 146.00
$ 146.00 - $ 146.00
$ 146.00
$ 118.00
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$ 118.00
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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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$ 307.00
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$ 307.00
$ 244.00
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$ 244.00

Foster PB5-3B, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Brass

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB5-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...

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$ 307.00
$ 307.00 - $ 307.00
$ 307.00
$ 244.00
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$ 244.00
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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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$ 161.00
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$ 161.00
$ 129.00
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$ 129.00

Foster PB5-3, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Steel

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB5-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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$ 161.00
$ 161.00 - $ 161.00
$ 161.00
$ 129.00
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$ 129.00
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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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$ 1,116.00
$ 1,116.00 - $ 1,116.00
$ 1,116.00
$ 893.00
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$ 893.00

Foster PB3-3S/S, 1/4" Industrial Plug x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, 303 Stainless

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...

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$ 1,116.00
$ 1,116.00 - $ 1,116.00
$ 1,116.00
$ 893.00
$ 893.00 - $ 893.00
$ 893.00
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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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$ 243.00
$ 243.00 - $ 243.00
$ 243.00
$ 195.00
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$ 195.00

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

Reliable, leak-free 1/4" connections for air and fluid lines. The Foster PB3-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most...

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$ 243.00
$ 243.00 - $ 243.00
$ 243.00
$ 195.00
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$ 195.00
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