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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
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster FM3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster FM2803W, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

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    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster SL2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FM2803S, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

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    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2803 is a Brass 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
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    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
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Sleeve Guard, Brass

    In stock

    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
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster SG1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster SG1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    View full details
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster SG3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    View full details
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster SG3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Dill Valve, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

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    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Sleeve Guard, Brass

    In stock

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

    Foster SG2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2903 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    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 SG3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    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
    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95

    Foster SG3003LV, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Less Valve, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3003LV is a Brass 1/4" industrial coupler from the Foster 3 Series — the...

    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
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Sleeve Guard, Brass

    In stock

    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
    €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster SG2803, 1/4" Industrial Coupler x 1/8" Female NPT, 3 Series, Sleeve Guard, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG2803 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    View full details
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 3SDC, 1/4" 3 Series Socket Dust Cap, Steel

    In stock

    Protect your 1/4" 3 Series quick sockets when not in use. The Foster 3SDC dust cap keeps dirt, chips, and moisture out of the coupling, helping pre...

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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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster BLSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...

    View full details
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster SD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD13-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

    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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster BLSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD11-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series...

    View full details
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

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

    In stock

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

    View full details
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster BLSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BLSD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series ...

    View full details
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95

    Foster SD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SD9-3 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — ...

    View full details
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95