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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
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 3703, 1/4" Industrial Coupler x 3/8" Hose ID, 3 Series, Brass/Steel

    In stock

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

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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
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster BL3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

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

    Foster 3653, 1/4" Industrial Coupler x 5/16" Hose ID, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3653 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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

    Foster 3603W, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...

    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
    €48,95 - €48,95
    €48,95
    €48,95 - €48,95
    €48,95

    Foster 3603S/S, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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    €48,95 - €48,95
    €48,95
    €48,95 - €48,95
    €48,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95

    Foster 3603S, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Steam/EPDM, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603S is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...

    View full details
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster BL3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3603 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

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

    Foster 3603, 1/4" Industrial Coupler x 1/4" Hose ID, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3603 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95

    Foster 1713W, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Water, Brass/SS

    In stock

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

    View full details
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95

    Foster BL1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL1713 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

    View full details
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 1713, 1/4" Industrial Coupler x 3/8" Push-On Hose Stem, 3 Series, Brass/Steel

    In stock

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

    View full details
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95

    Foster 1513W, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...

    View full details
    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95

    Foster BL1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

    View full details
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 1513, 1/4" Industrial Coupler x 1/4" Push-On Hose Stem, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 1513 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

    View full details
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95

    Foster 3303W, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...

    View full details
    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €50,95 - €50,95
    €50,95
    €50,95 - €50,95
    €50,95

    Foster BL3303S/S, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Ball Lock, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3303S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...

    View full details
    €50,95 - €50,95
    €50,95
    €50,95 - €50,95
    €50,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €47,95 - €47,95
    €47,95
    €47,95 - €47,95
    €47,95

    Foster 3303S/S, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

    View full details
    €47,95 - €47,95
    €47,95
    €47,95 - €47,95
    €47,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster 3303H, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Heat/Viton, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303H is a Steel 1/4" industrial coupler from the Foster 3 Series — the mo...

    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
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster BL3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3303 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series —...

    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
    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster 3303, 1/4" Industrial Coupler x 3/8" Male NPT, 3 Series, Brass/Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3303 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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

    Foster BL3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Ball Lock, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster BL3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — t...

    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
    €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster 3103W, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103W is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — the...

    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
    €32,95 - €32,95
    €32,95
    €32,95 - €32,95
    €32,95

    Foster 3103S/SLV, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Less Valve, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/SLV is a 303 Stainless 1/4" industrial coupler from the Foster 3 Ser...

    View full details
    €32,95 - €32,95
    €32,95
    €32,95 - €32,95
    €32,95
  • Foster 3PDC, 1/4" 3 Series Plug Dust Cap, Plastic
    €34,95 - €34,95
    €34,95
    €34,95 - €34,95
    €34,95

    Foster 3103S/SH, 1/4" Industrial Coupler x 1/4" Male NPT, 3 Series, Heat/Viton, 303 Stainless

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3103S/SH is a 303 Stainless 1/4" industrial coupler from the Foster 3 Seri...

    View full details
    €34,95 - €34,95
    €34,95
    €34,95 - €34,95
    €34,95