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Foster

Foster quick couplers set the standard in pneumatic and hydraulic connections. Part of the ZSI-Foster line, Foster couplers and plugs cover the full range of industrial interchanges and body sizes in steel, brass, and stainless construction. Built for reliable, repeatable connections in air and fluid systems. Shop the full Foster range below.

  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 35.59
    $ 35.59 - $ 35.59
    $ 35.59
    $ 28.49
    $ 28.49 - $ 28.49
    $ 28.49

    Foster FM4104W, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4104W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

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    $ 35.59
    $ 35.59 - $ 35.59
    $ 35.59
    $ 28.49
    $ 28.49 - $ 28.49
    $ 28.49
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  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 36.49
    $ 36.49 - $ 36.49
    $ 36.49
    $ 29.19
    $ 29.19 - $ 29.19
    $ 29.19

    Foster FM4104S, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Automatic, Steam/EPDM, Brass body, Brass sleeve, SS valve

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4104S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler fr...

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    $ 36.49
    $ 36.49 - $ 36.49
    $ 36.49
    $ 29.19
    $ 29.19 - $ 29.19
    $ 29.19
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  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 37.29
    $ 37.29 - $ 37.29
    $ 37.29
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79

    Foster SL4104, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4104 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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    $ 37.29
    $ 37.29 - $ 37.29
    $ 37.29
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79
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  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 31.79
    $ 31.79 - $ 31.79
    $ 31.79
    $ 25.39
    $ 25.39 - $ 25.39
    $ 25.39

    Foster FM4104, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4104 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 31.79
    $ 31.79 - $ 31.79
    $ 31.79
    $ 25.39
    $ 25.39 - $ 25.39
    $ 25.39
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 38.09
    $ 38.09 - $ 38.09
    $ 38.09
    $ 30.49
    $ 30.49 - $ 30.49
    $ 30.49

    Foster FM4404W, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4404W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

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    $ 38.09
    $ 38.09 - $ 38.09
    $ 38.09
    $ 30.49
    $ 30.49 - $ 30.49
    $ 30.49
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 37.29
    $ 37.29 - $ 37.29
    $ 37.29
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79

    Foster FM4404S, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Automatic, Steam/EPDM, Brass body, Brass sleeve, SS valve

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4404S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler fr...

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    $ 37.29
    $ 37.29 - $ 37.29
    $ 37.29
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 38.29
    $ 38.29 - $ 38.29
    $ 38.29
    $ 30.59
    $ 30.59 - $ 30.59
    $ 30.59

    Foster SL4404, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4404 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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    $ 38.29
    $ 38.29 - $ 38.29
    $ 38.29
    $ 30.59
    $ 30.59 - $ 30.59
    $ 30.59
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 32.79
    $ 32.79 - $ 32.79
    $ 32.79
    $ 26.19
    $ 26.19 - $ 26.19
    $ 26.19

    Foster FM4404, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4404 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 32.79
    $ 32.79 - $ 32.79
    $ 32.79
    $ 26.19
    $ 26.19 - $ 26.19
    $ 26.19
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 37.69
    $ 37.69 - $ 37.69
    $ 37.69
    $ 30.09
    $ 30.09 - $ 30.09
    $ 30.09

    Foster FM4204W, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4204W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 37.69
    $ 37.69 - $ 37.69
    $ 37.69
    $ 30.09
    $ 30.09 - $ 30.09
    $ 30.09
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 32.69
    $ 32.69 - $ 32.69
    $ 32.69
    $ 26.19
    $ 26.19 - $ 26.19
    $ 26.19

    Foster FM4204H, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Automatic, Heat/Viton, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4204H is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

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    $ 32.69
    $ 32.69 - $ 32.69
    $ 32.69
    $ 26.19
    $ 26.19 - $ 26.19
    $ 26.19
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 36.49
    $ 36.49 - $ 36.49
    $ 36.49
    $ 29.19
    $ 29.19 - $ 29.19
    $ 29.19

    Foster SL4204, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4204 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 36.49
    $ 36.49 - $ 36.49
    $ 36.49
    $ 29.19
    $ 29.19 - $ 29.19
    $ 29.19
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 31.99
    $ 31.99 - $ 31.99
    $ 31.99
    $ 25.59
    $ 25.59 - $ 25.59
    $ 25.59

    Foster FM4204, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4204 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 31.99
    $ 31.99 - $ 31.99
    $ 31.99
    $ 25.59
    $ 25.59 - $ 25.59
    $ 25.59
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 35.89
    $ 35.89 - $ 35.89
    $ 35.89
    $ 28.69
    $ 28.69 - $ 28.69
    $ 28.69

    Foster SL4004, 3/8" Industrial Coupler x 1/4" Female NPT, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4004 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 35.89
    $ 35.89 - $ 35.89
    $ 35.89
    $ 28.69
    $ 28.69 - $ 28.69
    $ 28.69
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 31.79
    $ 31.79 - $ 31.79
    $ 31.79
    $ 25.39
    $ 25.39 - $ 25.39
    $ 25.39

    Foster FM4004, 3/8" Industrial Coupler x 1/4" Female NPT, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4004 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    $ 31.79
    $ 31.79 - $ 31.79
    $ 31.79
    $ 25.39
    $ 25.39 - $ 25.39
    $ 25.39
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 32.29
    $ 32.29 - $ 32.29
    $ 32.29
    $ 25.79
    $ 25.79 - $ 25.79
    $ 25.79

    Foster SD13-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SD13-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

    View full details
    $ 32.29
    $ 32.29 - $ 32.29
    $ 32.29
    $ 25.79
    $ 25.79 - $ 25.79
    $ 25.79
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 31.09
    $ 31.09 - $ 31.09
    $ 31.09
    $ 24.89
    $ 24.89 - $ 24.89
    $ 24.89

    Foster SD11-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SD11-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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    $ 31.09
    $ 31.09 - $ 31.09
    $ 31.09
    $ 24.89
    $ 24.89 - $ 24.89
    $ 24.89
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 36.19
    $ 36.19 - $ 36.19
    $ 36.19
    $ 28.99
    $ 28.99 - $ 28.99
    $ 28.99

    Foster BLSD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BLSD9-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series ...

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    $ 36.19
    $ 36.19 - $ 36.19
    $ 36.19
    $ 28.99
    $ 28.99 - $ 28.99
    $ 28.99
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 30.29
    $ 30.29 - $ 30.29
    $ 30.29
    $ 24.29
    $ 24.29 - $ 24.29
    $ 24.29

    Foster SD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SD9-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 30.29
    $ 30.29 - $ 30.29
    $ 30.29
    $ 24.29
    $ 24.29 - $ 24.29
    $ 24.29
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 35.59
    $ 35.59 - $ 35.59
    $ 35.59
    $ 28.49
    $ 28.49 - $ 28.49
    $ 28.49

    Foster BLSD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BLSD7-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series ...

    View full details
    $ 35.59
    $ 35.59 - $ 35.59
    $ 35.59
    $ 28.49
    $ 28.49 - $ 28.49
    $ 28.49
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79
    $ 23.79
    $ 23.79 - $ 23.79
    $ 23.79

    Foster SD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SD7-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 29.79
    $ 29.79 - $ 29.79
    $ 29.79
    $ 23.79
    $ 23.79 - $ 23.79
    $ 23.79
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 34.79
    $ 34.79 - $ 34.79
    $ 34.79
    $ 27.79
    $ 27.79 - $ 27.79
    $ 27.79

    Foster SB7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SB7-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 34.79
    $ 34.79 - $ 34.79
    $ 34.79
    $ 27.79
    $ 27.79 - $ 27.79
    $ 27.79
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 35.49
    $ 35.49 - $ 35.49
    $ 35.49
    $ 28.39
    $ 28.39 - $ 28.39
    $ 28.39

    Foster SB5-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SB5-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 35.49
    $ 35.49 - $ 35.49
    $ 35.49
    $ 28.39
    $ 28.39 - $ 28.39
    $ 28.39
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79
    $ 27.09
    $ 27.09 - $ 27.09
    $ 27.09

    Foster SB3-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SB3-4 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79
    $ 27.09
    $ 27.09 - $ 27.09
    $ 27.09
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
    Save 20% Save %
    $ 34.49
    $ 34.49 - $ 34.49
    $ 34.49
    $ 27.59
    $ 27.59 - $ 27.59
    $ 27.59

    Foster 1814W, 3/8" Industrial Coupler x 1/2" Push-On Hose Stem, 4 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 1814W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a h...

    View full details
    $ 34.49
    $ 34.49 - $ 34.49
    $ 34.49
    $ 27.59
    $ 27.59 - $ 27.59
    $ 27.59
    Save 20% Save %