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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster FM3303W, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3303W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster SL3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3303 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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Automatic, Brass

    In stock

    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
    €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 SL3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster FM3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

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

    Foster FM3103S, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103S 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
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster SL3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Hot Water/Viton, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...

    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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster FM3103HW, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — ...

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

    Foster FM3103H, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Heat/Viton, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    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 SL3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Dill Valve, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103D 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
    €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3103D, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Dill Valve, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3103D is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    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
    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster SL3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3103 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 FM3103, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Automatic, Brass

    In stock

    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
    €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 SL2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL2903 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 FM2903, 1/4" Industrial Coupler x 1/8" Male NPT, 3 Series, Automatic, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM2903 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
    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster FM3203W, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203W 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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster FM3203H, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Heat/Viton, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3203H is a Brass 1/4" industrial coupler from the Foster 3 Series — the ...

    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 SL3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3203 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
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster FM3203, 1/4" Industrial Coupler x 3/8" Female NPT, 3 Series, Automatic, Brass

    In stock

    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
    €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster SL3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

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

    Foster FM3003W, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003W 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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster FM3003S, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003S 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
    €17,95 - €17,95
    €17,95
    €17,95 - €17,95
    €17,95

    Foster FM3003HW, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic, Hot Water/Viton, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster FM3003HW is a Brass/SS 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 SL3003, 1/4" Industrial Coupler x 1/4" Female NPT, 3 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SL3003 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