Skip to content
☀️ Take an Additional 10% Off Your Entire Order with code GEARUP10 at checkout.
☀️ Additional 10% Off • GEARUP10

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.

Filters

Save 20% Save %
$ 376.00
$ 376.00 - $ 376.00
$ 376.00
$ 301.00
$ 301.00 - $ 301.00
$ 301.00

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...

View full details
$ 376.00
$ 376.00 - $ 376.00
$ 376.00
$ 301.00
$ 301.00 - $ 301.00
$ 301.00
Save 20% Save %
Save 20% Save %
$ 393.00
$ 393.00 - $ 393.00
$ 393.00
$ 315.00
$ 315.00 - $ 315.00
$ 315.00

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...

View full details
$ 393.00
$ 393.00 - $ 393.00
$ 393.00
$ 315.00
$ 315.00 - $ 315.00
$ 315.00
Save 20% Save %
Save 20% Save %
$ 484.00
$ 484.00 - $ 484.00
$ 484.00
$ 387.00
$ 387.00 - $ 387.00
$ 387.00

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...

View full details
$ 484.00
$ 484.00 - $ 484.00
$ 484.00
$ 387.00
$ 387.00 - $ 387.00
$ 387.00
Save 20% Save %
Save 20% Save %
$ 395.00
$ 395.00 - $ 395.00
$ 395.00
$ 317.00
$ 317.00 - $ 317.00
$ 317.00

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...

View full details
$ 395.00
$ 395.00 - $ 395.00
$ 395.00
$ 317.00
$ 317.00 - $ 317.00
$ 317.00
Save 20% Save %
Save 20% Save %
$ 491.00
$ 491.00 - $ 491.00
$ 491.00
$ 392.00
$ 392.00 - $ 392.00
$ 392.00

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...

View full details
$ 491.00
$ 491.00 - $ 491.00
$ 491.00
$ 392.00
$ 392.00 - $ 392.00
$ 392.00
Save 20% Save %
Save 20% Save %
$ 494.00
$ 494.00 - $ 494.00
$ 494.00
$ 395.00
$ 395.00 - $ 395.00
$ 395.00

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...

View full details
$ 494.00
$ 494.00 - $ 494.00
$ 494.00
$ 395.00
$ 395.00 - $ 395.00
$ 395.00
Save 20% Save %
Save 20% Save %
$ 541.00
$ 541.00 - $ 541.00
$ 541.00
$ 433.00
$ 433.00 - $ 433.00
$ 433.00

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...

View full details
$ 541.00
$ 541.00 - $ 541.00
$ 541.00
$ 433.00
$ 433.00 - $ 433.00
$ 433.00
Save 20% Save %
Save 20% Save %
$ 282.00
$ 282.00 - $ 282.00
$ 282.00
$ 225.00
$ 225.00 - $ 225.00
$ 225.00

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...

View full details
$ 282.00
$ 282.00 - $ 282.00
$ 282.00
$ 225.00
$ 225.00 - $ 225.00
$ 225.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 19% Save %
$ 37.00
$ 37.00 - $ 37.00
$ 37.00
$ 30.00
$ 30.00 - $ 30.00
$ 30.00

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...

View full details
$ 37.00
$ 37.00 - $ 37.00
$ 37.00
$ 30.00
$ 30.00 - $ 30.00
$ 30.00
Save 19% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 211.00
$ 211.00 - $ 211.00
$ 211.00
$ 169.00
$ 169.00 - $ 169.00
$ 169.00

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...

View full details
$ 211.00
$ 211.00 - $ 211.00
$ 211.00
$ 169.00
$ 169.00 - $ 169.00
$ 169.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 183.00
$ 183.00 - $ 183.00
$ 183.00
$ 146.00
$ 146.00 - $ 146.00
$ 146.00

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...

View full details
$ 183.00
$ 183.00 - $ 183.00
$ 183.00
$ 146.00
$ 146.00 - $ 146.00
$ 146.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 167.00
$ 167.00 - $ 167.00
$ 167.00
$ 134.00
$ 134.00 - $ 134.00
$ 134.00

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 ...

View full details
$ 167.00
$ 167.00 - $ 167.00
$ 167.00
$ 134.00
$ 134.00 - $ 134.00
$ 134.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 19% Save %
$ 160.00
$ 160.00 - $ 160.00
$ 160.00
$ 129.00
$ 129.00 - $ 129.00
$ 129.00

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 ...

View full details
$ 160.00
$ 160.00 - $ 160.00
$ 160.00
$ 129.00
$ 129.00 - $ 129.00
$ 129.00
Save 19% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 573.00
$ 573.00 - $ 573.00
$ 573.00
$ 458.00
$ 458.00 - $ 458.00
$ 458.00

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 ...

View full details
$ 573.00
$ 573.00 - $ 573.00
$ 573.00
$ 458.00
$ 458.00 - $ 458.00
$ 458.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 338.00
$ 338.00 - $ 338.00
$ 338.00
$ 270.00
$ 270.00 - $ 270.00
$ 270.00

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 ...

View full details
$ 338.00
$ 338.00 - $ 338.00
$ 338.00
$ 270.00
$ 270.00 - $ 270.00
$ 270.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 449.00
$ 449.00 - $ 449.00
$ 449.00
$ 359.00
$ 359.00 - $ 359.00
$ 359.00

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 ...

View full details
$ 449.00
$ 449.00 - $ 449.00
$ 449.00
$ 359.00
$ 359.00 - $ 359.00
$ 359.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 246.00
$ 246.00 - $ 246.00
$ 246.00
$ 195.00
$ 195.00 - $ 195.00
$ 195.00

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...

View full details
$ 246.00
$ 246.00 - $ 246.00
$ 246.00
$ 195.00
$ 195.00 - $ 195.00
$ 195.00
Save 21% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 143.00
$ 143.00 - $ 143.00
$ 143.00
$ 115.00
$ 115.00 - $ 115.00
$ 115.00

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 ...

View full details
$ 143.00
$ 143.00 - $ 143.00
$ 143.00
$ 115.00
$ 115.00 - $ 115.00
$ 115.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 300.00
$ 300.00 - $ 300.00
$ 300.00
$ 239.00
$ 239.00 - $ 239.00
$ 239.00

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...

View full details
$ 300.00
$ 300.00 - $ 300.00
$ 300.00
$ 239.00
$ 239.00 - $ 239.00
$ 239.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 157.00
$ 157.00 - $ 157.00
$ 157.00
$ 126.00
$ 126.00 - $ 126.00
$ 126.00

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 ...

View full details
$ 157.00
$ 157.00 - $ 157.00
$ 157.00
$ 126.00
$ 126.00 - $ 126.00
$ 126.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 1,089.00
$ 1,089.00 - $ 1,089.00
$ 1,089.00
$ 872.00
$ 872.00 - $ 872.00
$ 872.00

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 ...

View full details
$ 1,089.00
$ 1,089.00 - $ 1,089.00
$ 1,089.00
$ 872.00
$ 872.00 - $ 872.00
$ 872.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 237.00
$ 237.00 - $ 237.00
$ 237.00
$ 190.00
$ 190.00 - $ 190.00
$ 190.00

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...

View full details
$ 237.00
$ 237.00 - $ 237.00
$ 237.00
$ 190.00
$ 190.00 - $ 190.00
$ 190.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 479.00
$ 479.00 - $ 479.00
$ 479.00
$ 383.00
$ 383.00 - $ 383.00
$ 383.00

Foster 14S-3, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Free Swivel, Brass/Steel

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...

View full details
$ 479.00
$ 479.00 - $ 479.00
$ 479.00
$ 383.00
$ 383.00 - $ 383.00
$ 383.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 21% Save %
$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 120.00
$ 120.00 - $ 120.00
$ 120.00

Foster 10S-3, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Free Swivel, Brass/Steel

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

View full details
$ 152.00
$ 152.00 - $ 152.00
$ 152.00
$ 120.00
$ 120.00 - $ 120.00
$ 120.00
Save 21% Save %

Request a Quote

Bulk and dealer pricing. Tell us what you need and we’ll reply within one business day.