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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.

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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 32.79
$ 32.79 - $ 32.79
$ 32.79
$ 26.19
$ 26.19 - $ 26.19
$ 26.19

Foster FM4804, 3/8" Industrial Coupler x 3/8" Hose ID, 4 Series, Automatic, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4804 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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$ 32.79
$ 32.79 - $ 32.79
$ 32.79
$ 26.19
$ 26.19 - $ 26.19
$ 26.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 37.89
$ 37.89 - $ 37.89
$ 37.89
$ 30.29
$ 30.29 - $ 30.29
$ 30.29

Foster SL4704, 3/8" Industrial Coupler x 5/16" Hose ID, 4 Series, Automatic Sleeve Lock, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4704 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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$ 37.89
$ 37.89 - $ 37.89
$ 37.89
$ 30.29
$ 30.29 - $ 30.29
$ 30.29
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 32.19
$ 32.19 - $ 32.19
$ 32.19
$ 25.79
$ 25.79 - $ 25.79
$ 25.79

Foster FM4704, 3/8" Industrial Coupler x 5/16" Hose ID, 4 Series, Automatic, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4704 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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$ 32.19
$ 32.19 - $ 32.19
$ 32.19
$ 25.79
$ 25.79 - $ 25.79
$ 25.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 37.29
$ 37.29 - $ 37.29
$ 37.29
$ 29.79
$ 29.79 - $ 29.79
$ 29.79

Foster SL4604, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Automatic Sleeve Lock, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4604 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
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 31.79
$ 31.79 - $ 31.79
$ 31.79
$ 25.39
$ 25.39 - $ 25.39
$ 25.39

Foster FM4604, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Automatic, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4604 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

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$ 31.79
$ 31.79 - $ 31.79
$ 31.79
$ 25.39
$ 25.39 - $ 25.39
$ 25.39
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.69
$ 36.69 - $ 36.69
$ 36.69
$ 29.29
$ 29.29 - $ 29.29
$ 29.29

Foster FM4504W, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Automatic, Water, Brass/SS

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4504W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

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$ 36.69
$ 36.69 - $ 36.69
$ 36.69
$ 29.29
$ 29.29 - $ 29.29
$ 29.29
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 38.69
$ 38.69 - $ 38.69
$ 38.69
$ 30.99
$ 30.99 - $ 30.99
$ 30.99

Foster FM4504S, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Automatic, Steam/EPDM, Brass body, Brass sleeve, SS valve

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4504S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler fr...

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$ 38.69
$ 38.69 - $ 38.69
$ 38.69
$ 30.99
$ 30.99 - $ 30.99
$ 30.99
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 38.29
$ 38.29 - $ 38.29
$ 38.29
$ 30.59
$ 30.59 - $ 30.59
$ 30.59

Foster SL4504, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Automatic Sleeve Lock, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4504 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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 32.39
$ 32.39 - $ 32.39
$ 32.39
$ 25.89
$ 25.89 - $ 25.89
$ 25.89

Foster FM4504, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Automatic, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4504 is a Brass 3/8" industrial coupler from the Foster 4 Series — a hig...

View full details
$ 32.39
$ 32.39 - $ 32.39
$ 32.39
$ 25.89
$ 25.89 - $ 25.89
$ 25.89
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 37.69
$ 37.69 - $ 37.69
$ 37.69
$ 30.09
$ 30.09 - $ 30.09
$ 30.09

Foster FM4304W, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Automatic, Water, Brass/SS

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4304W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a...

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$ 37.69
$ 37.69 - $ 37.69
$ 37.69
$ 30.09
$ 30.09 - $ 30.09
$ 30.09
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.89
$ 36.89 - $ 36.89
$ 36.89
$ 29.49
$ 29.49 - $ 29.49
$ 29.49

Foster FM4304S, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Automatic, Steam/EPDM, Brass body, Brass sleeve, SS valve

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4304S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler fr...

View full details
$ 36.89
$ 36.89 - $ 36.89
$ 36.89
$ 29.49
$ 29.49 - $ 29.49
$ 29.49
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 36.49
$ 36.49 - $ 36.49
$ 36.49
$ 29.19
$ 29.19 - $ 29.19
$ 29.19

Foster SL4304, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Automatic Sleeve Lock, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4304 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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 31.99
$ 31.99 - $ 31.99
$ 31.99
$ 25.59
$ 25.59 - $ 25.59
$ 25.59

Foster FM4304, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Automatic, Brass

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster FM4304 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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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...

View full details
$ 35.59
$ 35.59 - $ 35.59
$ 35.59
$ 28.49
$ 28.49 - $ 28.49
$ 28.49
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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...

View full details
$ 36.49
$ 36.49 - $ 36.49
$ 36.49
$ 29.19
$ 29.19 - $ 29.19
$ 29.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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...

View full details
$ 37.29
$ 37.29 - $ 37.29
$ 37.29
$ 29.79
$ 29.79 - $ 29.79
$ 29.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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...

View full details
$ 38.09
$ 38.09 - $ 38.09
$ 38.09
$ 30.49
$ 30.49 - $ 30.49
$ 30.49
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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

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...

View full details
$ 37.29
$ 37.29 - $ 37.29
$ 37.29
$ 29.79
$ 29.79 - $ 29.79
$ 29.79
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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

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...

View full details
$ 38.29
$ 38.29 - $ 38.29
$ 38.29
$ 30.59
$ 30.59 - $ 30.59
$ 30.59
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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

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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 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

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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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

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...

View full details
$ 32.69
$ 32.69 - $ 32.69
$ 32.69
$ 26.19
$ 26.19 - $ 26.19
$ 26.19
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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

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 %

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