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Pneumatic Quick Couplers

Pneumatic quick couplers connect and disconnect air lines in one quick motion, no tools required. This collection covers the full range of air quick couplers and plugs across every interchange, from miniature 2 Series to industrial body sizes, in steel, brass, and stainless. Filter by series, body size, thread, and material to find the exact coupler or plug your air system needs.

  • Original price $ 9.19
    Original price $ 9.19 - Original price $ 9.19
    Original price $ 9.19
    Current price $ 7.29
    $ 7.29 - $ 7.29
    Current price $ 7.29

    Foster 40-4B, 3/8" Industrial Plug x 1/4" Male NPT, 4 Series, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 40-4B is a Brass 3/8" industrial plug from the Foster 4 Series — a high-fl...

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    Original price $ 9.19
    Original price $ 9.19 - Original price $ 9.19
    Original price $ 9.19
    Current price $ 7.29
    $ 7.29 - $ 7.29
    Current price $ 7.29
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  • Original price $ 5.39
    Original price $ 5.39 - Original price $ 5.39
    Original price $ 5.39
    Current price $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29

    Foster 40-4, 3/8" Industrial Plug x 1/4" Male NPT, 4 Series, Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 40-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...

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    Original price $ 5.39
    Original price $ 5.39 - Original price $ 5.39
    Original price $ 5.39
    Current price $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29
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  • Original price $ 11.39
    Original price $ 11.39 - Original price $ 11.39
    Original price $ 11.39
    Current price $ 9.09
    $ 9.09 - $ 9.09
    Current price $ 9.09

    Foster 38-4, 3/8" Industrial Plug x 1/8" Male NPT, 4 Series, Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 38-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...

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    Original price $ 11.39
    Original price $ 11.39 - Original price $ 11.39
    Original price $ 11.39
    Current price $ 9.09
    $ 9.09 - $ 9.09
    Current price $ 9.09
    Save 20% Save %
  • Original price $ 9.29
    Original price $ 9.29 - Original price $ 9.29
    Original price $ 9.29
    Current price $ 7.39
    $ 7.39 - $ 7.39
    Current price $ 7.39

    Foster 45-4, 3/8" Industrial Plug x 1/2" Female NPT, 4 Series, Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 45-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...

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    Original price $ 9.29
    Original price $ 9.29 - Original price $ 9.29
    Original price $ 9.29
    Current price $ 7.39
    $ 7.39 - $ 7.39
    Current price $ 7.39
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  • Original price $ 19.39
    Original price $ 19.39 - Original price $ 19.39
    Original price $ 19.39
    Current price $ 15.49
    $ 15.49 - $ 15.49
    Current price $ 15.49

    Foster 43-4S/S, 3/8" Industrial Plug x 3/8" Female NPT, 4 Series, 303 Stainless

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 43-4S/S is a 303 Stainless 3/8" industrial plug from the Foster 4 Series —...

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    Original price $ 19.39
    Original price $ 19.39 - Original price $ 19.39
    Original price $ 19.39
    Current price $ 15.49
    $ 15.49 - $ 15.49
    Current price $ 15.49
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  • Original price $ 6.69
    Original price $ 6.69 - Original price $ 6.69
    Original price $ 6.69
    Current price $ 5.39
    $ 5.39 - $ 5.39
    Current price $ 5.39

    Foster 43-4, 3/8" Industrial Plug x 3/8" Female NPT, 4 Series, Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 43-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...

    View full details
    Original price $ 6.69
    Original price $ 6.69 - Original price $ 6.69
    Original price $ 6.69
    Current price $ 5.39
    $ 5.39 - $ 5.39
    Current price $ 5.39
    Save 19% Save %
  • Original price $ 5.39
    Original price $ 5.39 - Original price $ 5.39
    Original price $ 5.39
    Current price $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29

    Foster 41-4, 3/8" Industrial Plug x 1/4" Female NPT, 4 Series, Steel

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 41-4 is a Steel 3/8" industrial plug from the Foster 4 Series — a high-flo...

    View full details
    Original price $ 5.39
    Original price $ 5.39 - Original price $ 5.39
    Original price $ 5.39
    Current price $ 4.29
    $ 4.29 - $ 4.29
    Current price $ 4.29
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  • Original price $ 44.19
    Original price $ 44.19 - Original price $ 44.19
    Original price $ 44.19
    Current price $ 35.39
    $ 35.39 - $ 35.39
    Current price $ 35.39

    Foster SLSD13-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD13-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...

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    Original price $ 44.19
    Original price $ 44.19 - Original price $ 44.19
    Original price $ 44.19
    Current price $ 35.39
    $ 35.39 - $ 35.39
    Current price $ 35.39
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  • Original price $ 38.69
    Original price $ 38.69 - Original price $ 38.69
    Original price $ 38.69
    Current price $ 30.99
    $ 30.99 - $ 30.99
    Current price $ 30.99

    Foster FMSD13-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 13/16" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD13-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...

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    Original price $ 38.69
    Original price $ 38.69 - Original price $ 38.69
    Original price $ 38.69
    Current price $ 30.99
    $ 30.99 - $ 30.99
    Current price $ 30.99
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  • Original price $ 43.79
    Original price $ 43.79 - Original price $ 43.79
    Original price $ 43.79
    Current price $ 35.09
    $ 35.09 - $ 35.09
    Current price $ 35.09

    Foster SLSD11-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD11-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...

    View full details
    Original price $ 43.79
    Original price $ 43.79 - Original price $ 43.79
    Original price $ 43.79
    Current price $ 35.09
    $ 35.09 - $ 35.09
    Current price $ 35.09
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  • Original price $ 38.09
    Original price $ 38.09 - Original price $ 38.09
    Original price $ 38.09
    Current price $ 30.49
    $ 30.49 - $ 30.49
    Current price $ 30.49

    Foster FMSD11-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 3/4" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD11-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a h...

    View full details
    Original price $ 38.09
    Original price $ 38.09 - Original price $ 38.09
    Original price $ 38.09
    Current price $ 30.49
    $ 30.49 - $ 30.49
    Current price $ 30.49
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  • Original price $ 43.19
    Original price $ 43.19 - Original price $ 43.19
    Original price $ 43.19
    Current price $ 34.49
    $ 34.49 - $ 34.49
    Current price $ 34.49

    Foster SLSD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD9-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 43.19
    Original price $ 43.19 - Original price $ 43.19
    Original price $ 43.19
    Current price $ 34.49
    $ 34.49 - $ 34.49
    Current price $ 34.49
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  • Original price $ 37.49
    Original price $ 37.49 - Original price $ 37.49
    Original price $ 37.49
    Current price $ 29.99
    $ 29.99 - $ 29.99
    Current price $ 29.99

    Foster FMSD9-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 11/16" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD9-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 37.49
    Original price $ 37.49 - Original price $ 37.49
    Original price $ 37.49
    Current price $ 29.99
    $ 29.99 - $ 29.99
    Current price $ 29.99
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  • Original price $ 42.49
    Original price $ 42.49 - Original price $ 42.49
    Original price $ 42.49
    Current price $ 33.99
    $ 33.99 - $ 33.99
    Current price $ 33.99

    Foster SLSD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSD7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 42.49
    Original price $ 42.49 - Original price $ 42.49
    Original price $ 42.49
    Current price $ 33.99
    $ 33.99 - $ 33.99
    Current price $ 33.99
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  • Original price $ 50.39
    Original price $ 50.39 - Original price $ 50.39
    Original price $ 50.39
    Current price $ 40.29
    $ 40.29 - $ 40.29
    Current price $ 40.29

    Foster FMSD7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 3/8" ID x 5/8" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSD7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 50.39
    Original price $ 50.39 - Original price $ 50.39
    Original price $ 50.39
    Current price $ 40.29
    $ 40.29 - $ 40.29
    Current price $ 40.29
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  • Original price $ 42.49
    Original price $ 42.49 - Original price $ 42.49
    Original price $ 42.49
    Current price $ 33.99
    $ 33.99 - $ 33.99
    Current price $ 33.99

    Foster SLSB7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 42.49
    Original price $ 42.49 - Original price $ 42.49
    Original price $ 42.49
    Current price $ 33.99
    $ 33.99 - $ 33.99
    Current price $ 33.99
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  • Original price $ 38.29
    Original price $ 38.29 - Original price $ 38.29
    Original price $ 38.29
    Current price $ 30.59
    $ 30.59 - $ 30.59
    Current price $ 30.59

    Foster FMSB7-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 5/8" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB7-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 38.29
    Original price $ 38.29 - Original price $ 38.29
    Original price $ 38.29
    Current price $ 30.59
    $ 30.59 - $ 30.59
    Current price $ 30.59
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  • Original price $ 42.09
    Original price $ 42.09 - Original price $ 42.09
    Original price $ 42.09
    Current price $ 33.69
    $ 33.69 - $ 33.69
    Current price $ 33.69

    Foster SLSB5-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB5-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

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    Original price $ 42.09
    Original price $ 42.09 - Original price $ 42.09
    Original price $ 42.09
    Current price $ 33.69
    $ 33.69 - $ 33.69
    Current price $ 33.69
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  • Original price $ 37.89
    Original price $ 37.89 - Original price $ 37.89
    Original price $ 37.89
    Current price $ 30.29
    $ 30.29 - $ 30.29
    Current price $ 30.29

    Foster FMSB5-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 9/16" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB5-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 37.89
    Original price $ 37.89 - Original price $ 37.89
    Original price $ 37.89
    Current price $ 30.29
    $ 30.29 - $ 30.29
    Current price $ 30.29
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  • Original price $ 39.59
    Original price $ 39.59 - Original price $ 39.59
    Original price $ 39.59
    Current price $ 31.69
    $ 31.69 - $ 31.69
    Current price $ 31.69

    Foster SLSB3-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SLSB3-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

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    Original price $ 39.59
    Original price $ 39.59 - Original price $ 39.59
    Original price $ 39.59
    Current price $ 31.69
    $ 31.69 - $ 31.69
    Current price $ 31.69
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  • Original price $ 35.59
    Original price $ 35.59 - Original price $ 35.59
    Original price $ 35.59
    Current price $ 28.49
    $ 28.49 - $ 28.49
    Current price $ 28.49

    Foster FMSB3-4, 3/8" Industrial Coupler x Reusable Hose Fitting, 1/4" ID x 1/2" OD, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FMSB3-4 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hi...

    View full details
    Original price $ 35.59
    Original price $ 35.59 - Original price $ 35.59
    Original price $ 35.59
    Current price $ 28.49
    $ 28.49 - $ 28.49
    Current price $ 28.49
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  • Original price $ 39.89
    Original price $ 39.89 - Original price $ 39.89
    Original price $ 39.89
    Current price $ 31.99
    $ 31.99 - $ 31.99
    Current price $ 31.99

    Foster FM1814W, 3/8" Industrial Coupler x 1/2" Push-On Hose Stem, 4 Series, Automatic, Water, Brass/SS

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM1814W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

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    Original price $ 39.89
    Original price $ 39.89 - Original price $ 39.89
    Original price $ 39.89
    Current price $ 31.99
    $ 31.99 - $ 31.99
    Current price $ 31.99
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  • Original price $ 41.69
    Original price $ 41.69 - Original price $ 41.69
    Original price $ 41.69
    Current price $ 33.39
    $ 33.39 - $ 33.39
    Current price $ 33.39

    Foster SL1814, 3/8" Industrial Coupler x 1/2" Push-On Hose Stem, 4 Series, Automatic Sleeve Lock, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL1814 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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    Original price $ 41.69
    Original price $ 41.69 - Original price $ 41.69
    Original price $ 41.69
    Current price $ 33.39
    $ 33.39 - $ 33.39
    Current price $ 33.39
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  • Original price $ 35.89
    Original price $ 35.89 - Original price $ 35.89
    Original price $ 35.89
    Current price $ 28.69
    $ 28.69 - $ 28.69
    Current price $ 28.69

    Foster FM1814, 3/8" Industrial Coupler x 1/2" Push-On Hose Stem, 4 Series, Automatic, Brass

    In stock

    Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM1814 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

    View full details
    Original price $ 35.89
    Original price $ 35.89 - Original price $ 35.89
    Original price $ 35.89
    Current price $ 28.69
    $ 28.69 - $ 28.69
    Current price $ 28.69
    Save 20% Save %