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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.

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

    Foster 12-3S/S, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/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
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 12-3B, 1/4" Industrial Plug x 1/8" Male NPT, 3 Series, Brass

    In stock

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

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

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

    In stock

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

    Foster 15-3, 1/4" Industrial Plug x 3/8" Female NPT, 3 Series, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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

    Foster 11-3S/S, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 11-3S/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
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 11-3B, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, Brass

    In stock

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

    Foster 11-3, 1/4" Industrial Plug x 1/4" Female NPT, 3 Series, Steel

    In stock

    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
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €24,95 - €24,95
    €24,95
    €24,95 - €24,95
    €24,95

    Foster 13-3S/S, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

    View full details
    €24,95 - €24,95
    €24,95
    €24,95 - €24,95
    €24,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €4,95 - €4,95
    €4,95
    €4,95 - €4,95
    €4,95

    Foster 13-3B, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, Brass

    In stock

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

    Foster 13-3, 1/4" Industrial Plug x 1/8" Female NPT, 3 Series, Steel

    In stock

    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
    €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SD11-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Slim Profile, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3GS is a Steel 1/4" industrial coupler 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
    €26,95 - €26,95
    €26,95
    €26,95 - €26,95
    €26,95

    Foster SD11-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD11-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the...

    View full details
    €26,95 - €26,95
    €26,95
    €26,95 - €26,95
    €26,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SD7-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3GS is a Steel 1/4" industrial coupler 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
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95

    Foster SD7-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD7-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SB7-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3GS is a Steel 1/4" industrial coupler 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
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95

    Foster SB7-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB7-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster SB5-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic Slim Profile, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €26,95 - €26,95
    €26,95
    €26,95 - €26,95
    €26,95

    Foster SB5-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB5-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €26,95 - €26,95
    €26,95
    €26,95 - €26,95
    €26,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster SB3-3GS, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Slim Profile, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95

    Foster SB3-3GB, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SB3-3GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €23,95 - €23,95
    €23,95
    €23,95 - €23,95
    €23,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster 1713GB, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic Slim Profile, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 1713GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    View full details
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €22,95 - €22,95
    €22,95
    €22,95 - €22,95
    €22,95

    Foster 1513GB, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic Slim Profile, Brass

    In stock

    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
    €22,95 - €22,95
    €22,95
    €22,95 - €22,95
    €22,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster 3703GS, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Slim Profile, Steel

    In stock

    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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €21,95 - €21,95
    €21,95
    €21,95 - €21,95
    €21,95

    Foster 3703GB, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Slim Profile, Brass

    In stock

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

    View full details
    €21,95 - €21,95
    €21,95
    €21,95 - €21,95
    €21,95