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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.

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    Foster FM3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, 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
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    €1,95
    €1,95 - €1,95
    €1,95

    Foster 10-3, 3 Series, Industrial Plug, 1/4" Male NPT, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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    €1,95 - €1,95
    €1,95
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  • €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster 3003, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Brass, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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    €10,95 - €10,95
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    €10,95
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    €2,95
    €2,95 - €2,95
    €2,95

    Foster 10-3B, 3 Series, Industrial Plug, 1/4" Male NPT, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 10-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

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    €9,95
    €9,95 - €9,95
    €9,95

    Foster 3103, 3 Series, Industrial Coupler, Manual, 1/4" Male NPT, Brass, Steel

    In stock

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

    View full details
    €9,95 - €9,95
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  • €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

    Foster 11-3, 3 Series, Industrial Plug, 1/4" Female NPT, 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
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    €2,95

    Foster 12-3, 3 Series, Industrial Plug, 1/8" Male NPT, 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...

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    €2,95 - €2,95
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    €2,95
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    €2,95

    Foster 16-3, 3 Series, Industrial Plug, 1/4" Hose Barb, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 16-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €2,95 - €2,95
    €2,95
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    €2,95
  • €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 11-3B, 3 Series, Industrial Plug, 1/4" Female NPT, 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
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    €3,95
  • €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster FM3103, 3 Series, Industrial Coupler, Automatic, 1/4" Male NPT, 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
  • €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster 3003GB, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €16,95 - €16,95
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  • €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3103, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Male NPT, 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
  • €4,95 - €4,95
    €4,95
    €4,95 - €4,95
    €4,95

    Foster 13-3B, 3 Series, Industrial Plug, 1/8" Female NPT, 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
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    €5,95
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    €5,95

    Foster 17-3B, 3 Series, Industrial Plug, 3/8" Hose Barb, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3B is a Brass 1/4" industrial plug from the Foster 3 Series — the most ...

    View full details
    €5,95 - €5,95
    €5,95
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    €5,95
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    €15,95
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    €15,95

    Foster 3003GS, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003GS is a Steel 1/4" industrial coupler from the Foster 3 Series — the m...

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    €15,95 - €15,95
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  • €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €2,95

    Foster 17-3, 3 Series, Industrial Plug, 3/8" Hose Barb, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €2,95 - €2,95
    €2,95
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    €2,95
  • €10,95 - €10,95
    €10,95
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    Foster 3603, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, 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
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    €10,95
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    €15,95
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    €15,95

    Foster FM3203, 3 Series, Industrial Coupler, Automatic, 3/8" Female NPT, 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
  • €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3003, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Female NPT, 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
  • €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95

    Foster 3303, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, 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
  • €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 3703, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, 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...

    View full details
    €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95
  • €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95

    Foster 3003HW, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Brass (HOT WATER)

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003HW is a Brass/SS 1/4" industrial coupler from the Foster 3 Series — th...

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    €14,95 - €14,95
    €14,95
    €14,95 - €14,95
    €14,95
  • €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3303, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, 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
  • €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3603, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Hose Barb, 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