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.

  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95

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

    In stock

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

    View full details
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

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

    In stock

    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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95

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

    In stock

    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
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €7,95 - €7,95
    €7,95
    €7,95 - €7,95
    €7,95

    Foster 12S-3, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Free Swivel, Brass/Steel

    In stock

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

    View full details
    €7,95 - €7,95
    €7,95
    €7,95 - €7,95
    €7,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 71-3, 1/4" Industrial Plug x 3/8" Push-On Hose Stem, 3 Series, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 71-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 51-3, 1/4" Industrial Plug x 1/4" Push-On Hose Stem, 3 Series, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 51-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €31,95 - €31,95
    €31,95
    €31,95 - €31,95
    €31,95

    Foster 17-3S/S, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

    View full details
    €31,95 - €31,95
    €31,95
    €31,95 - €31,95
    €31,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95

    Foster 17-3B, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, Brass

    In stock

    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
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

    Foster 17-3, 1/4" Industrial Plug x 3/8" Hose ID, 3 Series, Steel

    In stock

    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
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95

    Foster 165-3, 1/4" Industrial Plug x 5/16" Hose ID, 3 Series, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 165-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

    View full details
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95

    Foster 16-3B, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

    View full details
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

    Foster 16-3, 1/4" Industrial Plug x 1/4" Hose ID, 3 Series, Steel

    In stock

    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
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95

    Foster 14-3GB, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Ball Check, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3GB is a Brass 1/4" industrial plug from the Foster 3 Series — the most...

    View full details
    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95

    Foster 14-3B, 1/4" Industrial Plug x 3/8" Male NPT, 3 Series, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

    View full details
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

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

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95

    Foster 10-3GS/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3GS/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series ...

    View full details
    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95

    Foster 10-3GS, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel

    In stock

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

    View full details
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95

    Foster 10-3GB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Brass

    In stock

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

    View full details
    €5,95 - €5,95
    €5,95
    €5,95 - €5,95
    €5,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 10-3G, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Ball Check, Steel

    In stock

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

    View full details
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster 10-3DB, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Brass

    In stock

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

    View full details
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster 10-3D, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, Dill Valve, Steel

    In stock

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

    View full details
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95

    Foster 10-3S/S, 1/4" Industrial Plug x 1/4" Male NPT, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

    View full details
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

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

    In stock

    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
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €1,95 - €1,95
    €1,95
    €1,95 - €1,95
    €1,95

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

    In stock

    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
    €1,95 - €1,95
    €1,95
    €1,95 - €1,95
    €1,95