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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 %
$ 33.59
$ 33.59 - $ 33.59
$ 33.59
$ 26.89
$ 26.89 - $ 26.89
$ 26.89

Foster BL4804, 3/8" Industrial Coupler x 3/8" Hose ID, 4 Series, Ball Lock, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4804 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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$ 33.59
$ 33.59 - $ 33.59
$ 33.59
$ 26.89
$ 26.89 - $ 26.89
$ 26.89
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 %
$ 28.19
$ 28.19 - $ 28.19
$ 28.19
$ 22.59
$ 22.59 - $ 22.59
$ 22.59

Foster 4804, 3/8" Industrial Coupler x 3/8" Hose ID, 4 Series, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4804 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

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$ 28.19
$ 28.19 - $ 28.19
$ 28.19
$ 22.59
$ 22.59 - $ 22.59
$ 22.59
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 %
$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39

Foster BL4704, 3/8" Industrial Coupler x 5/16" Hose ID, 4 Series, Ball Lock, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4704 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39
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 %
$ 28.79
$ 28.79 - $ 28.79
$ 28.79
$ 22.99
$ 22.99 - $ 22.99
$ 22.99

Foster 4704, 3/8" Industrial Coupler x 5/16" Hose ID, 4 Series, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4704 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

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$ 28.79
$ 28.79 - $ 28.79
$ 28.79
$ 22.99
$ 22.99 - $ 22.99
$ 22.99
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 %
$ 32.39
$ 32.39 - $ 32.39
$ 32.39
$ 25.99
$ 25.99 - $ 25.99
$ 25.99

Foster 4604W, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Water, Brass/SS

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4604W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a h...

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$ 32.39
$ 32.39 - $ 32.39
$ 32.39
$ 25.99
$ 25.99 - $ 25.99
$ 25.99
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 %
$ 32.59
$ 32.59 - $ 32.59
$ 32.59
$ 26.09
$ 26.09 - $ 26.09
$ 26.09

Foster BL4604, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Ball Lock, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4604 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series —...

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$ 32.59
$ 32.59 - $ 32.59
$ 32.59
$ 26.09
$ 26.09 - $ 26.09
$ 26.09
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 %
$ 27.39
$ 27.39 - $ 27.39
$ 27.39
$ 21.89
$ 21.89 - $ 21.89
$ 21.89

Foster 4604, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4604 is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — a...

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$ 27.39
$ 27.39 - $ 27.39
$ 27.39
$ 21.89
$ 21.89 - $ 21.89
$ 21.89
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 %
$ 33.39
$ 33.39 - $ 33.39
$ 33.39
$ 26.79
$ 26.79 - $ 26.79
$ 26.79

Foster 4504W, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Water, Brass/SS

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4504W is a Brass/SS 3/8" industrial coupler from the Foster 4 Series — a h...

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$ 33.39
$ 33.39 - $ 33.39
$ 33.39
$ 26.79
$ 26.79 - $ 26.79
$ 26.79
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 %
$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39

Foster 4504S, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Steam/EPDM, Brass body, Brass sleeve, SS valve

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4504S is a Brass body, Brass sleeve, SS valve 3/8" industrial coupler from...

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$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39
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 %
$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39

Foster 4504H, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Heat/Viton, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4504H is a Brass/Steel 3/8" industrial coupler from the Foster 4 Series — ...

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$ 32.99
$ 32.99 - $ 32.99
$ 32.99
$ 26.39
$ 26.39 - $ 26.39
$ 26.39
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 %
$ 33.19
$ 33.19 - $ 33.19
$ 33.19
$ 26.59
$ 26.59 - $ 26.59
$ 26.59

Foster BL4504, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Ball Lock, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster BL4504 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
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 %
$ 27.99
$ 27.99 - $ 27.99
$ 27.99
$ 22.39
$ 22.39 - $ 22.39
$ 22.39

Foster 4504, 3/8" Industrial Coupler x 1/2" Male NPT, 4 Series, Brass/Steel

Reliable, leak-free 3/8" connections for air and fluid lines. The Foster 4504 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 BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 29.49
$ 29.49 - $ 29.49
$ 29.49
$ 23.59
$ 23.59 - $ 23.59
$ 23.59

Foster 4304W, 3/8" Industrial Coupler x 3/8" Male NPT, 4 Series, Water, Brass/SS

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

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$ 29.49
$ 29.49 - $ 29.49
$ 29.49
$ 23.59
$ 23.59 - $ 23.59
$ 23.59
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 %
$ 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

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
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 %
$ 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

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
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 %
$ 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

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
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 %
$ 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

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 —...

View full details
$ 29.29
$ 29.29 - $ 29.29
$ 29.29
$ 23.49
$ 23.49 - $ 23.49
$ 23.49
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 %
$ 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

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

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...

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

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
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 %
$ 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

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 — ...

View full details
$ 27.89
$ 27.89 - $ 27.89
$ 27.89
$ 22.29
$ 22.29 - $ 22.29
$ 22.29
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 %
$ 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

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

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

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 —...

View full details
$ 33.19
$ 33.19 - $ 33.19
$ 33.19
$ 26.59
$ 26.59 - $ 26.59
$ 26.59
Save 20% Save %

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