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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
    €22,95 - €22,95
    €22,95
    €22,95 - €22,95
    €22,95

    Foster SLSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    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
    €21,95 - €21,95
    €21,95
    €21,95 - €21,95
    €21,95

    Foster SLSB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SLSB3-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €21,95 - €21,95
    €21,95
    €21,95 - €21,95
    €21,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €22,95 - €22,95
    €22,95
    €22,95 - €22,95
    €22,95

    Foster FMSD13-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD13-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the...

    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
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster FMSD11-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD11-3 is a Brass 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
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster FMSD9-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD9-3 is a Brass 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
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster FMSD7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSD7-3 is a Brass 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
    €28,95 - €28,95
    €28,95
    €28,95 - €28,95
    €28,95

    Foster FMSC7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 5/8" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSC7-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €28,95 - €28,95
    €28,95
    €28,95 - €28,95
    €28,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €28,95 - €28,95
    €28,95
    €28,95 - €28,95
    €28,95

    Foster FMSC5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 5/16" ID x 9/16" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSC5-3 is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    View full details
    €28,95 - €28,95
    €28,95
    €28,95 - €28,95
    €28,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster FMSB7-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB7-3 is a Brass 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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FMSB5-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB5-3 is a Brass 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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FMSB3-3, 1/4" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FMSB3-3 is a Brass 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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FM3703S, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SL3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3703 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3703 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
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster SL3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3653 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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3653 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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FM3603S, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SL3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3603 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

    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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3603 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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster FM1713W, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1713W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster SL1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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

    Foster FM1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1713 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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster SL1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL1513 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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

    Foster FM1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM1513 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