Skip to content

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 %
$ 267.00
$ 267.00 - $ 267.00
$ 267.00
$ 214.00
$ 214.00 - $ 214.00
$ 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...

View full details
$ 267.00
$ 267.00 - $ 267.00
$ 267.00
$ 214.00
$ 214.00 - $ 214.00
$ 214.00
Save 20% Save %
Save 21% Save %
$ 43.00
$ 43.00 - $ 43.00
$ 43.00
$ 34.00
$ 34.00 - $ 34.00
$ 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...

View full details
$ 43.00
$ 43.00 - $ 43.00
$ 43.00
$ 34.00
$ 34.00 - $ 34.00
$ 34.00
Save 21% Save %
Save 19% Save %
$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 55.00
$ 55.00 - $ 55.00
$ 55.00

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 ...

View full details
$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 55.00
$ 55.00 - $ 55.00
$ 55.00
Save 19% Save %
Save 20% Save %
$ 242.00
$ 242.00 - $ 242.00
$ 242.00
$ 194.00
$ 194.00 - $ 194.00
$ 194.00

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...

View full details
$ 242.00
$ 242.00 - $ 242.00
$ 242.00
$ 194.00
$ 194.00 - $ 194.00
$ 194.00
Save 20% Save %
Save 19% Save %
$ 48.00
$ 48.00 - $ 48.00
$ 48.00
$ 39.00
$ 39.00 - $ 39.00
$ 39.00

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...

View full details
$ 48.00
$ 48.00 - $ 48.00
$ 48.00
$ 39.00
$ 39.00 - $ 39.00
$ 39.00
Save 19% Save %
Save 21% Save %
$ 52.00
$ 52.00 - $ 52.00
$ 52.00
$ 41.00
$ 41.00 - $ 41.00
$ 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...

View full details
$ 52.00
$ 52.00 - $ 52.00
$ 52.00
$ 41.00
$ 41.00 - $ 41.00
$ 41.00
Save 21% Save %
Save 21% Save %
$ 61.00
$ 61.00 - $ 61.00
$ 61.00
$ 48.00
$ 48.00 - $ 48.00
$ 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...

View full details
$ 61.00
$ 61.00 - $ 61.00
$ 61.00
$ 48.00
$ 48.00 - $ 48.00
$ 48.00
Save 21% Save %
Save 21% Save %
$ 86.00
$ 86.00 - $ 86.00
$ 86.00
$ 68.00
$ 68.00 - $ 68.00
$ 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 ...

View full details
$ 86.00
$ 86.00 - $ 86.00
$ 86.00
$ 68.00
$ 68.00 - $ 68.00
$ 68.00
Save 21% Save %
Save 20% Save %
$ 392.00
$ 392.00 - $ 392.00
$ 392.00
$ 313.00
$ 313.00 - $ 313.00
$ 313.00

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...

View full details
$ 392.00
$ 392.00 - $ 392.00
$ 392.00
$ 313.00
$ 313.00 - $ 313.00
$ 313.00
Save 20% Save %
Save 20% Save %
$ 418.00
$ 418.00 - $ 418.00
$ 418.00
$ 335.00
$ 335.00 - $ 335.00
$ 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...

View full details
$ 418.00
$ 418.00 - $ 418.00
$ 418.00
$ 335.00
$ 335.00 - $ 335.00
$ 335.00
Save 20% Save %
Save 20% Save %
$ 231.00
$ 231.00 - $ 231.00
$ 231.00
$ 185.00
$ 185.00 - $ 185.00
$ 185.00

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...

View full details
$ 231.00
$ 231.00 - $ 231.00
$ 231.00
$ 185.00
$ 185.00 - $ 185.00
$ 185.00
Save 20% Save %
Save 20% Save %
$ 100.00
$ 100.00 - $ 100.00
$ 100.00
$ 80.00
$ 80.00 - $ 80.00
$ 80.00

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 ...

View full details
$ 100.00
$ 100.00 - $ 100.00
$ 100.00
$ 80.00
$ 80.00 - $ 80.00
$ 80.00
Save 20% Save %
Save 19% Save %
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
$ 105.00
$ 105.00 - $ 105.00
$ 105.00

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 ...

View full details
$ 130.00
$ 130.00 - $ 130.00
$ 130.00
$ 105.00
$ 105.00 - $ 105.00
$ 105.00
Save 19% Save %
Save 20% Save %
$ 383.00
$ 383.00 - $ 383.00
$ 383.00
$ 306.00
$ 306.00 - $ 306.00
$ 306.00

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...

View full details
$ 383.00
$ 383.00 - $ 383.00
$ 383.00
$ 306.00
$ 306.00 - $ 306.00
$ 306.00
Save 20% Save %
Save 21% Save %
$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 54.00
$ 54.00 - $ 54.00
$ 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...

View full details
$ 68.00
$ 68.00 - $ 68.00
$ 68.00
$ 54.00
$ 54.00 - $ 54.00
$ 54.00
Save 21% Save %
Save 20% Save %
$ 256.00
$ 256.00 - $ 256.00
$ 256.00
$ 205.00
$ 205.00 - $ 205.00
$ 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...

View full details
$ 256.00
$ 256.00 - $ 256.00
$ 256.00
$ 205.00
$ 205.00 - $ 205.00
$ 205.00
Save 20% Save %
Save 20% Save %
$ 395.00
$ 395.00 - $ 395.00
$ 395.00
$ 317.00
$ 317.00 - $ 317.00
$ 317.00

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...

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 %
$ 230.00
$ 230.00 - $ 230.00
$ 230.00
$ 183.00
$ 183.00 - $ 183.00
$ 183.00

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...

View full details
$ 230.00
$ 230.00 - $ 230.00
$ 230.00
$ 183.00
$ 183.00 - $ 183.00
$ 183.00
Save 20% Save %
Save 20% Save %
$ 267.00
$ 267.00 - $ 267.00
$ 267.00
$ 214.00
$ 214.00 - $ 214.00
$ 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...

View full details
$ 267.00
$ 267.00 - $ 267.00
$ 267.00
$ 214.00
$ 214.00 - $ 214.00
$ 214.00
Save 20% Save %
Save 20% Save %
$ 279.00
$ 279.00 - $ 279.00
$ 279.00
$ 224.00
$ 224.00 - $ 224.00
$ 224.00

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...

View full details
$ 279.00
$ 279.00 - $ 279.00
$ 279.00
$ 224.00
$ 224.00 - $ 224.00
$ 224.00
Save 20% Save %
Save 20% Save %
$ 354.00
$ 354.00 - $ 354.00
$ 354.00
$ 283.00
$ 283.00 - $ 283.00
$ 283.00

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...

View full details
$ 354.00
$ 354.00 - $ 354.00
$ 354.00
$ 283.00
$ 283.00 - $ 283.00
$ 283.00
Save 20% Save %
Save 20% Save %
$ 399.00
$ 399.00 - $ 399.00
$ 399.00
$ 319.00
$ 319.00 - $ 319.00
$ 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...

View full details
$ 399.00
$ 399.00 - $ 399.00
$ 399.00
$ 319.00
$ 319.00 - $ 319.00
$ 319.00
Save 20% Save %
Save 20% Save %
$ 240.00
$ 240.00 - $ 240.00
$ 240.00
$ 192.00
$ 192.00 - $ 192.00
$ 192.00

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...

View full details
$ 240.00
$ 240.00 - $ 240.00
$ 240.00
$ 192.00
$ 192.00 - $ 192.00
$ 192.00
Save 20% Save %
Save 20% Save %
$ 59.00
$ 59.00 - $ 59.00
$ 59.00
$ 47.00
$ 47.00 - $ 47.00
$ 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...

View full details
$ 59.00
$ 59.00 - $ 59.00
$ 59.00
$ 47.00
$ 47.00 - $ 47.00
$ 47.00
Save 20% Save %

Request a Quote

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