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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 13-3, 3 Series, Industrial Plug, 1/8" Female NPT, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 13-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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    Foster 165-3, 3 Series, Industrial Plug, 5/16" Hose Barb, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 165-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most ...

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

    In stock

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

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    Foster SG1713, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Push-On Hose Barb, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG1713 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    Foster 71-3, 3 Series, Industrial Plug, 3/8" Hose Barb (Push-On), Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 71-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

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  • €47,95 - €47,95
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    Foster 3303S/S, 3 Series, Industrial Coupler, Manual, 3/8" Male NPT, Stainless Steel

    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...

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    €47,95 - €47,95
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    Foster 3203GB, 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 3203GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    Foster SL3003, 3 Series, Industrial Coupler, Automatic, 1/4" Female NPT, Brass With Ball Sleeve Lock

    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...

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

    In stock

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

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  • €9,95 - €9,95
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    Foster SG3203, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Female NPT, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3203 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    Foster SG3303, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Male NPT, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3303 is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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  • €31,95 - €31,95
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    Foster 3003S/S, 3 Series, Industrial Coupler, Manual, 1/4" Female NPT, Stainless Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3003S/S is a 303 Stainless 1/4" industrial coupler from the Foster 3 Serie...

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    €31,95 - €31,95
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    Foster 12-3B, 3 Series, Industrial Plug, 1/8" Male NPT, Brass

    In stock

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

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  • €19,95 - €19,95
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    Foster 3103GB, 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 3103GB is a Brass 1/4" industrial coupler from the Foster 3 Series — the m...

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    €19,95 - €19,95
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  • €21,95 - €21,95
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    Foster 3703GB, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, Brass

    In stock

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

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    €21,95 - €21,95
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    Foster 14-3, 3 Series, Industrial Plug, 3/8" Male NPT, Steel

    In stock

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

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

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 3203 is a Brass/Steel 1/4" industrial coupler from the Foster 3 Series — t...

    View full details
    €10,95 - €10,95
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    Foster 15-3, 3 Series, Industrial Plug, 3/8" Female NPT, Steel

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster 15-3 is a Steel 1/4" industrial plug from the Foster 3 Series — the most p...

    View full details
    €4,95 - €4,95
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  • €15,95 - €15,95
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    Foster FM1713, 3 Series, Industrial Coupler, Automatic, 3/8" Push-On Hose Barb, 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
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    €16,95
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    €16,95

    Foster FM3603, 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 FM3603 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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    Foster FM3703, 3 Series, Industrial Coupler, Automatic, 3/8" Hose Barb, 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
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    €16,95
  • €9,95 - €9,95
    €9,95
    €9,95 - €9,95
    €9,95

    Foster SG3703, 3 Series, Industrial Coupler, Manual, Sleeve Guard, 3/8" Hose Barb, Brass

    In stock

    Reliable, leak-free 1/4" connections for air and fluid lines. The Foster SG3703 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
  • €11,95 - €11,95
    €11,95
    €11,95 - €11,95
    €11,95

    Foster 1713, 3 Series, Industrial Coupler, Manual, 3/8" Hose Barb (Push-On), 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...

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    €11,95 - €11,95
    €11,95
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    €11,95
  • €6,95 - €6,95
    €6,95
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    €6,95

    Foster 14-3B, 3 Series, Industrial Plug, 3/8" Male NPT, Brass

    In stock

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

    View full details
    €6,95 - €6,95
    €6,95
    €6,95 - €6,95
    €6,95