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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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    $ 50.29
    $ 50.29 - $ 50.29
    $ 50.29
    $ 40.19
    $ 40.19 - $ 40.19
    $ 40.19

    Foster BL4304S/S, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Ball Lock, 303 Stainless

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4304S/S is a 303 Stainless 3/8" industrial coupler from the Foster 4 Ser...

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    $ 50.29
    $ 50.29 - $ 50.29
    $ 50.29
    $ 40.19
    $ 40.19 - $ 40.19
    $ 40.19
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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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    $ 49.39
    $ 49.39 - $ 49.39
    $ 49.39
    $ 39.49
    $ 39.49 - $ 39.49
    $ 39.49

    Foster 4304S/S, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, 303 Stainless

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4304S/S is a 303 Stainless 3/8" industrial coupler from the Foster 4 Serie...

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    $ 49.39
    $ 49.39 - $ 49.39
    $ 49.39
    $ 39.49
    $ 39.49 - $ 39.49
    $ 39.49
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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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    $ 30.19
    $ 30.19 - $ 30.19
    $ 30.19
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09

    Foster 4304S, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Steam/EPDM, Brass body, Brass sleeve, SS valve

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4304S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler from...

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    $ 30.19
    $ 30.19 - $ 30.19
    $ 30.19
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09
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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
    Save 20% Save %
    $ 29.29
    $ 29.29 - $ 29.29
    $ 29.29
    $ 23.49
    $ 23.49 - $ 23.49
    $ 23.49

    Foster BL4304, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4304 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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    $ 29.29
    $ 29.29 - $ 29.29
    $ 29.29
    $ 23.49
    $ 23.49 - $ 23.49
    $ 23.49
    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 %
    $ 25.19
    $ 25.19 - $ 25.19
    $ 25.19
    $ 20.09
    $ 20.09 - $ 20.09
    $ 20.09

    Foster 4304, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4304 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 25.19
    $ 25.19 - $ 25.19
    $ 25.19
    $ 20.09
    $ 20.09 - $ 20.09
    $ 20.09
    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 %
    $ 28.29
    $ 28.29 - $ 28.29
    $ 28.29
    $ 22.69
    $ 22.69 - $ 22.69
    $ 22.69

    Foster 4104W, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4104W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a h...

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    $ 28.29
    $ 28.29 - $ 28.29
    $ 28.29
    $ 22.69
    $ 22.69 - $ 22.69
    $ 22.69
    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 %
    $ 29.09
    $ 29.09 - $ 29.09
    $ 29.09
    $ 23.29
    $ 23.29 - $ 23.29
    $ 23.29

    Foster 4104S, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Steam/EPDM, Brass body, Brass sleeve, SS valve

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4104S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler from...

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    $ 29.09
    $ 29.09 - $ 29.09
    $ 29.09
    $ 23.29
    $ 23.29 - $ 23.29
    $ 23.29
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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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    $ 27.89
    $ 27.89 - $ 27.89
    $ 27.89
    $ 22.29
    $ 22.29 - $ 22.29
    $ 22.29

    Foster 4104H, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Heat/Viton, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4104H is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

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    $ 27.89
    $ 27.89 - $ 27.89
    $ 27.89
    $ 22.29
    $ 22.29 - $ 22.29
    $ 22.29
    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 %
    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49

    Foster BL4104, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4104 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

    View full details
    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49
    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 %
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09
    $ 19.29
    $ 19.29 - $ 19.29
    $ 19.29

    Foster 4104, 3/8" Industrial Coupler x 1/4" Male NPT, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4104 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09
    $ 19.29
    $ 19.29 - $ 19.29
    $ 19.29
    Save 20% Save %
  • Foster PD13-4, 3/8" Industrial Plug x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Steel
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    $ 33.19
    $ 33.19 - $ 33.19
    $ 33.19
    $ 26.59
    $ 26.59 - $ 26.59
    $ 26.59

    Foster BL4404, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4404 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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    $ 33.19
    $ 33.19 - $ 33.19
    $ 33.19
    $ 26.59
    $ 26.59 - $ 26.59
    $ 26.59
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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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    $ 27.99
    $ 27.99 - $ 27.99
    $ 27.99
    $ 22.39
    $ 22.39 - $ 22.39
    $ 22.39

    Foster 4404, 3/8" Industrial Coupler x 1/2" Female NPT, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4404 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 27.99
    $ 27.99 - $ 27.99
    $ 27.99
    $ 22.39
    $ 22.39 - $ 22.39
    $ 22.39
    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 %
    $ 29.49
    $ 29.49 - $ 29.49
    $ 29.49
    $ 23.59
    $ 23.59 - $ 23.59
    $ 23.59

    Foster 4204W, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4204W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a h...

    View full details
    $ 29.49
    $ 29.49 - $ 29.49
    $ 29.49
    $ 23.59
    $ 23.59 - $ 23.59
    $ 23.59
    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 %
    $ 51.89
    $ 51.89 - $ 51.89
    $ 51.89
    $ 41.49
    $ 41.49 - $ 41.49
    $ 41.49

    Foster BL4204S/S, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Ball Lock, 303 Stainless

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4204S/S is a 303 Stainless 3/8" industrial coupler from the Foster 4 Ser...

    View full details
    $ 51.89
    $ 51.89 - $ 51.89
    $ 51.89
    $ 41.49
    $ 41.49 - $ 41.49
    $ 41.49
    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 %
    $ 48.89
    $ 48.89 - $ 48.89
    $ 48.89
    $ 39.09
    $ 39.09 - $ 39.09
    $ 39.09

    Foster 4204S/S, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, 303 Stainless

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4204S/S is a 303 Stainless 3/8" industrial coupler from the Foster 4 Serie...

    View full details
    $ 48.89
    $ 48.89 - $ 48.89
    $ 48.89
    $ 39.09
    $ 39.09 - $ 39.09
    $ 39.09
    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 %
    $ 30.19
    $ 30.19 - $ 30.19
    $ 30.19
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09

    Foster 4204S, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Steam/EPDM, Brass body, Brass sleeve, SS valve

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4204S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler from...

    View full details
    $ 30.19
    $ 30.19 - $ 30.19
    $ 30.19
    $ 24.09
    $ 24.09 - $ 24.09
    $ 24.09
    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 %
    $ 29.09
    $ 29.09 - $ 29.09
    $ 29.09
    $ 23.29
    $ 23.29 - $ 23.29
    $ 23.29

    Foster 4204H, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Heat/Viton, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4204H is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

    View full details
    $ 29.09
    $ 29.09 - $ 29.09
    $ 29.09
    $ 23.29
    $ 23.29 - $ 23.29
    $ 23.29
    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 %
    $ 28.89
    $ 28.89 - $ 28.89
    $ 28.89
    $ 23.09
    $ 23.09 - $ 23.09
    $ 23.09

    Foster BL4204, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4204 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

    View full details
    $ 28.89
    $ 28.89 - $ 28.89
    $ 28.89
    $ 23.09
    $ 23.09 - $ 23.09
    $ 23.09
    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 %
    $ 24.19
    $ 24.19 - $ 24.19
    $ 24.19
    $ 19.39
    $ 19.39 - $ 19.39
    $ 19.39

    Foster 4204, 3/8" Industrial Coupler x 3/8" Female NPT, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4204 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 24.19
    $ 24.19 - $ 24.19
    $ 24.19
    $ 19.39
    $ 19.39 - $ 19.39
    $ 19.39
    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 %
    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49

    Foster BL4004, 3/8" Industrial Coupler x 1/4" Female NPT, 4 Series, Ball Lock, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4004 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

    View full details
    $ 28.09
    $ 28.09 - $ 28.09
    $ 28.09
    $ 22.49
    $ 22.49 - $ 22.49
    $ 22.49
    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 %
    $ 23.39
    $ 23.39 - $ 23.39
    $ 23.39
    $ 18.79
    $ 18.79 - $ 18.79
    $ 18.79

    Foster 4004, 3/8" Industrial Coupler x 1/4" Female NPT, 4 Series, Brass/Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4004 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

    View full details
    $ 23.39
    $ 23.39 - $ 23.39
    $ 23.39
    $ 18.79
    $ 18.79 - $ 18.79
    $ 18.79
    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 %
    $ 10.89
    $ 10.89 - $ 10.89
    $ 10.89
    $ 8.69
    $ 8.69 - $ 8.69
    $ 8.69

    Foster PJ8-2S/S, 1/8" 2 Series Plug x 1/4" Tube, 303 Stainless

    In stock

    Dependable, leak-free connections for air and light fluid lines. The Foster PJ8-2S/S is a 303 Stainless 1/8" plug from the proven Foster 2 Series —...

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    $ 10.89
    $ 10.89 - $ 10.89
    $ 10.89
    $ 8.69
    $ 8.69 - $ 8.69
    $ 8.69
    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 %
    $ 11.79
    $ 11.79 - $ 11.79
    $ 11.79
    $ 9.39
    $ 9.39 - $ 9.39
    $ 9.39

    Foster PJ8-2VM, 1/8" 2 Series Plug x 1/4" Soft Metal Tube, Brass Valve Core, Brass

    In stock

    Dependable, leak-free connections for air and light fluid lines. The Foster PJ8-2VM is a Brass 1/8" plug from the proven Foster 2 Series — a miniat...

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    $ 11.79
    $ 11.79 - $ 11.79
    $ 11.79
    $ 9.39
    $ 9.39 - $ 9.39
    $ 9.39
    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 %
    $ 9.79
    $ 9.79 - $ 9.79
    $ 9.79
    $ 7.79
    $ 7.79 - $ 7.79
    $ 7.79

    Foster PJ8-2M, 1/8" 2 Series Plug x 1/4" Soft Metal Tube, Steel

    In stock

    Dependable, leak-free connections for air and light fluid lines. The Foster PJ8-2M is a Steel 1/8" plug from the proven Foster 2 Series — a miniatu...

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    $ 9.79
    $ 9.79 - $ 9.79
    $ 9.79
    $ 7.79
    $ 7.79 - $ 7.79
    $ 7.79
    Save 20% Save %