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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 %
$ 362.00
$ 362.00 - $ 362.00
$ 362.00
$ 289.00
$ 289.00 - $ 289.00
$ 289.00

Foster K3S-104, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Silicone Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S-104 is a steel 3/8" plug in the FHK S...

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$ 362.00
$ 362.00 - $ 362.00
$ 362.00
$ 289.00
$ 289.00 - $ 289.00
$ 289.00
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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 %
$ 349.00
$ 349.00 - $ 349.00
$ 349.00
$ 279.00
$ 279.00 - $ 279.00
$ 279.00

Foster K3S-103, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, EPDM Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S-103 is a steel 3/8" plug in the FHK S...

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$ 349.00
$ 349.00 - $ 349.00
$ 349.00
$ 279.00
$ 279.00 - $ 279.00
$ 279.00
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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 %
$ 358.00
$ 358.00 - $ 358.00
$ 358.00
$ 286.00
$ 286.00 - $ 286.00
$ 286.00

Foster K3S-102, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Neoprene Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S-102 is a steel 3/8" plug in the FHK S...

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$ 358.00
$ 358.00 - $ 358.00
$ 358.00
$ 286.00
$ 286.00 - $ 286.00
$ 286.00
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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 %
$ 370.00
$ 370.00 - $ 370.00
$ 370.00
$ 296.00
$ 296.00 - $ 296.00
$ 296.00

Foster K3S-101, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Viton Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S-101 is a steel 3/8" plug in the FHK S...

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$ 370.00
$ 370.00 - $ 370.00
$ 370.00
$ 296.00
$ 296.00 - $ 296.00
$ 296.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 792.00
$ 792.00 - $ 792.00
$ 792.00
$ 633.00
$ 633.00 - $ 633.00
$ 633.00

Foster K3S/S-103, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, EPDM Seal, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S/S-103 is a 303 stainless 3/8" plug in...

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$ 792.00
$ 792.00 - $ 792.00
$ 792.00
$ 633.00
$ 633.00 - $ 633.00
$ 633.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 795.00
$ 795.00 - $ 795.00
$ 795.00
$ 635.00
$ 635.00 - $ 635.00
$ 635.00

Foster K3S/S-101, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Viton Seal, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S/S-101 is a 303 stainless 3/8" plug in...

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$ 795.00
$ 795.00 - $ 795.00
$ 795.00
$ 635.00
$ 635.00 - $ 635.00
$ 635.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 716.00
$ 716.00 - $ 716.00
$ 716.00
$ 573.00
$ 573.00 - $ 573.00
$ 573.00

Foster K3S/S, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S/S is a 303 stainless 3/8" plug in the...

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$ 716.00
$ 716.00 - $ 716.00
$ 716.00
$ 573.00
$ 573.00 - $ 573.00
$ 573.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 293.00
$ 293.00 - $ 293.00
$ 293.00
$ 235.00
$ 235.00 - $ 235.00
$ 235.00

Foster K3S, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S is a steel 3/8" plug in the FHK Serie...

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$ 293.00
$ 293.00 - $ 293.00
$ 293.00
$ 235.00
$ 235.00 - $ 235.00
$ 235.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 393.00
$ 393.00 - $ 393.00
$ 393.00
$ 316.00
$ 316.00 - $ 316.00
$ 316.00

Foster K3B-103, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, EPDM Seal, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3B-103 is a brass 3/8" plug in the FHK S...

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$ 393.00
$ 393.00 - $ 393.00
$ 393.00
$ 316.00
$ 316.00 - $ 316.00
$ 316.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 420.00
$ 420.00 - $ 420.00
$ 420.00
$ 337.00
$ 337.00 - $ 337.00
$ 337.00

Foster K3B-102, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Neoprene Seal, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3B-102 is a brass 3/8" plug in the FHK S...

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$ 420.00
$ 420.00 - $ 420.00
$ 420.00
$ 337.00
$ 337.00 - $ 337.00
$ 337.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 430.00
$ 430.00 - $ 430.00
$ 430.00
$ 346.00
$ 346.00 - $ 346.00
$ 346.00

Foster K3B-101, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Viton Seal, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3B-101 is a brass 3/8" plug in the FHK S...

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$ 430.00
$ 430.00 - $ 430.00
$ 430.00
$ 346.00
$ 346.00 - $ 346.00
$ 346.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 321.00
$ 321.00 - $ 321.00
$ 321.00
$ 258.00
$ 258.00 - $ 258.00
$ 258.00

Foster K3B, 3/8" ISO-B Hydraulic Plug x 3/8" Female NPT, ISO-B Series, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3B is a brass 3/8" plug in the FHK Serie...

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$ 321.00
$ 321.00 - $ 321.00
$ 321.00
$ 258.00
$ 258.00 - $ 258.00
$ 258.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 203.00
$ 203.00 - $ 203.00
$ 203.00
$ 162.00
$ 162.00 - $ 162.00
$ 162.00

Foster K2SLV, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Less Valve, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2SLV is a steel 1/4" plug in the FHK Ser...

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$ 203.00
$ 203.00 - $ 203.00
$ 203.00
$ 162.00
$ 162.00 - $ 162.00
$ 162.00
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Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 288.00
$ 288.00 - $ 288.00
$ 288.00
$ 229.00
$ 229.00 - $ 229.00
$ 229.00

Foster K2S6, 1/4" ISO-B Hydraulic Plug x 9/16"-18 SAE, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S6 is a steel 1/4" plug in the FHK Seri...

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$ 288.00
$ 288.00 - $ 288.00
$ 288.00
$ 229.00
$ 229.00 - $ 229.00
$ 229.00
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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 %
$ 263.00
$ 263.00 - $ 263.00
$ 263.00
$ 210.00
$ 210.00 - $ 210.00
$ 210.00

Foster K2S-104, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Silicone Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S-104 is a steel 1/4" plug in the FHK S...

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$ 263.00
$ 263.00 - $ 263.00
$ 263.00
$ 210.00
$ 210.00 - $ 210.00
$ 210.00
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 %
$ 256.00
$ 256.00 - $ 256.00
$ 256.00
$ 205.00
$ 205.00 - $ 205.00
$ 205.00

Foster K2S-103, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, EPDM Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S-103 is a steel 1/4" plug in the FHK S...

View full details
$ 256.00
$ 256.00 - $ 256.00
$ 256.00
$ 205.00
$ 205.00 - $ 205.00
$ 205.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 259.00
$ 259.00 - $ 259.00
$ 259.00
$ 208.00
$ 208.00 - $ 208.00
$ 208.00

Foster K2S-101, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Viton Seal, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S-101 is a steel 1/4" plug in the FHK S...

View full details
$ 259.00
$ 259.00 - $ 259.00
$ 259.00
$ 208.00
$ 208.00 - $ 208.00
$ 208.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 450.00
$ 450.00 - $ 450.00
$ 450.00
$ 360.00
$ 360.00 - $ 360.00
$ 360.00

Foster K2S/SLV, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Less Valve, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S/SLV is a 303 stainless 1/4" plug in t...

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$ 450.00
$ 450.00 - $ 450.00
$ 450.00
$ 360.00
$ 360.00 - $ 360.00
$ 360.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 510.00
$ 510.00 - $ 510.00
$ 510.00
$ 409.00
$ 409.00 - $ 409.00
$ 409.00

Foster K2S/S-104, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Silicone Seal, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S/S-104 is a 303 stainless 1/4" plug in...

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$ 510.00
$ 510.00 - $ 510.00
$ 510.00
$ 409.00
$ 409.00 - $ 409.00
$ 409.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 501.00
$ 501.00 - $ 501.00
$ 501.00
$ 402.00
$ 402.00 - $ 402.00
$ 402.00

Foster K2S/S-103, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, EPDM Seal, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S/S-103 is a 303 stainless 1/4" plug in...

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$ 501.00
$ 501.00 - $ 501.00
$ 501.00
$ 402.00
$ 402.00 - $ 402.00
$ 402.00
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 %
$ 504.00
$ 504.00 - $ 504.00
$ 504.00
$ 404.00
$ 404.00 - $ 404.00
$ 404.00

Foster K2S/S-101, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Viton Seal, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S/S-101 is a 303 stainless 1/4" plug in...

View full details
$ 504.00
$ 504.00 - $ 504.00
$ 504.00
$ 404.00
$ 404.00 - $ 404.00
$ 404.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 441.00
$ 441.00 - $ 441.00
$ 441.00
$ 353.00
$ 353.00 - $ 353.00
$ 353.00

Foster K2S/S, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, 303 Stainless Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S/S is a 303 stainless 1/4" plug in the...

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$ 441.00
$ 441.00 - $ 441.00
$ 441.00
$ 353.00
$ 353.00 - $ 353.00
$ 353.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 200.00
$ 200.00 - $ 200.00
$ 200.00
$ 161.00
$ 161.00 - $ 161.00
$ 161.00

Foster K2S, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2S is a steel 1/4" plug in the FHK Serie...

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$ 200.00
$ 200.00 - $ 200.00
$ 200.00
$ 161.00
$ 161.00 - $ 161.00
$ 161.00
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
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$ 244.00
$ 244.00 - $ 244.00
$ 244.00
$ 196.00
$ 196.00 - $ 196.00
$ 196.00

Foster K2BLV, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Less Valve, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2BLV is a brass 1/4" plug in the FHK Ser...

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$ 244.00
$ 244.00 - $ 244.00
$ 244.00
$ 196.00
$ 196.00 - $ 196.00
$ 196.00
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