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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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    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
    €3,95

    Foster 51-3, 3 Series, Industrial Plug, 1/4" Hose Barb (Push-On), Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 51-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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    €3,95 - €3,95
    €3,95
    €3,95 - €3,95
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  • €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95

    Foster 12-3S/S, 3 Series, Industrial Plug, 1/8" Male NPT, Stainless Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

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    €8,95 - €8,95
    €8,95
    €8,95 - €8,95
    €8,95
  • €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95

    Foster 2803, 3 Series, Industrial Coupler, Manual, 1/8" Female NPT, Brass, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

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    €13,95 - €13,95
    €13,95
    €13,95 - €13,95
    €13,95
  • €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 2903, 3 Series, Industrial Coupler, Manual, 1/8" Male NPT, Brass, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2903 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
  • €48,95 - €48,95
    €48,95
    €48,95 - €48,95
    €48,95

    Foster 3603S/S, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb, Stainless Steel

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

    Foster FM1513, 3 Series, Industrial Coupler, Automatic, 1/4" Push-On Hose Barb, 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...

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

    Foster 3303GS, 3 Series, Industrial Coupler, Automatic, 3/8" Male NPT, Brass, Steel

    In stock

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

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    €15,95 - €15,95
    €15,95
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    €15,95
  • €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95

    Foster 2803GB, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 2803GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €18,95 - €18,95
    €18,95
    €18,95 - €18,95
    €18,95
  • €2,95 - €2,95
    €2,95
    €2,95 - €2,95
    €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...

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    €2,95 - €2,95
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    €2,95
  • €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95

    Foster 3603GB, 3 Series, Industrial Coupler, Automatic, 1/4" Hose Barb, Brass

    In stock

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

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    €20,95 - €20,95
    €20,95
    €20,95 - €20,95
    €20,95
  • €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM2803, 3 Series, Industrial Coupler, Automatic, 1/8" Female NPT, 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
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    €16,95
  • €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster FM2903, 3 Series, Industrial Coupler, Automatic, 1/8" Male NPT, 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
  • €10,95 - €10,95
    €10,95
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    €10,95

    Foster SG1513, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/4" Push-On Hose Barb, 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...

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    €10,95 - €10,95
    €10,95
    €10,95 - €10,95
    €10,95
  • €15,95 - €15,95
    €15,95
    €15,95 - €15,95
    €15,95

    Foster SG2803, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Female NPT, 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
  • €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster SG2903, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 1/8" Male NPT, 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
  • €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 1513, 3 Series, Industrial Coupler, Manual, 1/4" Hose Barb (Push-On), 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
  • €12,95 - €12,95
    €12,95
    €12,95 - €12,95
    €12,95

    Foster 3653, 3 Series, Industrial Coupler, Manual, 5/16" Hose Barb, 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
  • €32,95 - €32,95
    €32,95
    €32,95 - €32,95
    €32,95

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

    In stock

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

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    €32,95 - €32,95
    €32,95
    €32,95 - €32,95
    €32,95
  • €31,95 - €31,95
    €31,95
    €31,95 - €31,95
    €31,95

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

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 17-3S/S is a 303 Stainless 1/4" industrial plug from the Foster 3 Series —...

    View full details
    €31,95 - €31,95
    €31,95
    €31,95 - €31,95
    €31,95
  • €7,95 - €7,95
    €7,95
    €7,95 - €7,95
    €7,95

    Foster 12S-3, 3 Series, Industrial Swivel Plug, 1/8" Male NPT, Steel, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 12S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...

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    €7,95 - €7,95
    €7,95
    €7,95 - €7,95
    €7,95
  • €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95

    Foster 14S-3, 3 Series, Industrial Swivel Plug, 3/8" Male NPT, Steel, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 14S-3 is a Brass/Steel 1/4" industrial plug from the Foster 3 Series — the...

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    €19,95 - €19,95
    €19,95
    €19,95 - €19,95
    €19,95
  • €47,95 - €47,95
    €47,95
    €47,95 - €47,95
    €47,95

    Foster 3203S/S, 3 Series, Industrial Coupler, Manual, 3/8" Female NPT, Stainless Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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    €47,95 - €47,95
    €47,95
    €47,95 - €47,95
    €47,95
  • €49,95 - €49,95
    €49,95
    €49,95 - €49,95
    €49,95

    Foster 3703S/S, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb, Stainless Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3703S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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    €49,95 - €49,95
    €49,95
    €49,95 - €49,95
    €49,95
  • €16,95 - €16,95
    €16,95
    €16,95 - €16,95
    €16,95

    Foster FM3653, 3 Series, Industrial Coupler, Automatic, 5/16" Hose Barb, 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