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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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$ 1,299.00
$ 1,299.00 - $ 1,299.00
$ 1,299.00
$ 1,040.00
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$ 1,040.00

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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$ 1,299.00
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$ 1,299.00
$ 1,040.00
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$ 1,040.00
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$ 438.00
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$ 438.00
$ 351.00
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$ 351.00

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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$ 438.00
$ 438.00 - $ 438.00
$ 438.00
$ 351.00
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$ 351.00
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$ 561.00
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$ 561.00
$ 450.00
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$ 450.00

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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$ 561.00
$ 561.00 - $ 561.00
$ 561.00
$ 450.00
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$ 450.00
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$ 310.00
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$ 310.00
$ 249.00
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$ 249.00

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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$ 310.00
$ 310.00 - $ 310.00
$ 310.00
$ 249.00
$ 249.00 - $ 249.00
$ 249.00
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$ 408.00
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$ 408.00
$ 327.00
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$ 327.00

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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$ 408.00
$ 408.00 - $ 408.00
$ 408.00
$ 327.00
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$ 327.00
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$ 427.00
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$ 427.00
$ 342.00
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$ 342.00

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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$ 427.00
$ 427.00 - $ 427.00
$ 427.00
$ 342.00
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$ 342.00
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$ 525.00
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$ 525.00
$ 419.00
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$ 419.00

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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$ 525.00
$ 525.00 - $ 525.00
$ 525.00
$ 419.00
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$ 419.00
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$ 429.00
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$ 429.00
$ 344.00
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$ 344.00

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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$ 429.00
$ 429.00 - $ 429.00
$ 429.00
$ 344.00
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$ 344.00
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$ 533.00
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$ 533.00
$ 425.00
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$ 425.00

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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$ 533.00
$ 533.00 - $ 533.00
$ 533.00
$ 425.00
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$ 425.00
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$ 536.00
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$ 536.00
$ 429.00
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$ 429.00

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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$ 536.00
$ 536.00 - $ 536.00
$ 536.00
$ 429.00
$ 429.00 - $ 429.00
$ 429.00
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$ 587.00
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$ 587.00
$ 470.00
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$ 470.00

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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$ 587.00
$ 587.00 - $ 587.00
$ 587.00
$ 470.00
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$ 470.00
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$ 306.00
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$ 306.00
$ 244.00
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$ 244.00

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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$ 306.00
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$ 306.00
$ 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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$ 40.00
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$ 40.00
$ 32.00
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$ 32.00

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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$ 40.00
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$ 40.00
$ 32.00
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$ 32.00
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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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$ 229.00
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$ 229.00
$ 183.00
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$ 183.00

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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$ 229.00
$ 229.00 - $ 229.00
$ 229.00
$ 183.00
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$ 183.00
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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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$ 198.00
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$ 198.00
$ 159.00
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$ 159.00

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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$ 198.00
$ 198.00 - $ 198.00
$ 198.00
$ 159.00
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$ 159.00
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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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$ 182.00
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$ 182.00
$ 146.00
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$ 146.00

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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$ 182.00
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$ 182.00
$ 146.00
$ 146.00 - $ 146.00
$ 146.00
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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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$ 174.00
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$ 174.00
$ 140.00
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$ 140.00

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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$ 174.00
$ 174.00 - $ 174.00
$ 174.00
$ 140.00
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$ 140.00
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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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$ 621.00
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$ 621.00
$ 497.00
$ 497.00 - $ 497.00
$ 497.00

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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$ 621.00
$ 621.00 - $ 621.00
$ 621.00
$ 497.00
$ 497.00 - $ 497.00
$ 497.00
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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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$ 366.00
$ 366.00 - $ 366.00
$ 366.00
$ 293.00
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$ 293.00

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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$ 366.00
$ 366.00 - $ 366.00
$ 366.00
$ 293.00
$ 293.00 - $ 293.00
$ 293.00
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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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$ 487.00
$ 487.00 - $ 487.00
$ 487.00
$ 389.00
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$ 389.00

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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$ 487.00
$ 487.00 - $ 487.00
$ 487.00
$ 389.00
$ 389.00 - $ 389.00
$ 389.00
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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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$ 266.00
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$ 266.00
$ 212.00
$ 212.00 - $ 212.00
$ 212.00

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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$ 266.00
$ 266.00 - $ 266.00
$ 266.00
$ 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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$ 155.00
$ 155.00 - $ 155.00
$ 155.00
$ 125.00
$ 125.00 - $ 125.00
$ 125.00

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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$ 155.00
$ 155.00 - $ 155.00
$ 155.00
$ 125.00
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$ 125.00
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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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$ 325.00
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$ 325.00
$ 259.00
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$ 259.00

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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$ 325.00
$ 325.00 - $ 325.00
$ 325.00
$ 259.00
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$ 259.00
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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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$ 170.00
$ 170.00 - $ 170.00
$ 170.00
$ 136.00
$ 136.00 - $ 136.00
$ 136.00

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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$ 170.00
$ 170.00 - $ 170.00
$ 170.00
$ 136.00
$ 136.00 - $ 136.00
$ 136.00
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