Skip to content
☀️ Take an Additional 10% Off Your Entire Order with code GEARUP10 at checkout.
☀️ Additional 10% Off • GEARUP10

Hydraulic Quick Couplers

Hydraulic quick couplers join high-pressure fluid lines with a secure, leak-free connection. This collection covers ISO-B, ISO-A, flush face, and specialty hydraulic couplers and plugs in steel, brass, and stainless. Filter by series, body size, thread, and material to match your hydraulic system.

Filters

Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass Save 20% Save %
$ 18.19
$ 18.19 - $ 18.19
$ 18.19
$ 14.59
$ 14.59 - $ 14.59
$ 14.59

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...

View full details
$ 18.19
$ 18.19 - $ 18.19
$ 18.19
$ 14.59
$ 14.59 - $ 14.59
$ 14.59
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 %
$ 11.49
$ 11.49 - $ 11.49
$ 11.49
$ 9.19
$ 9.19 - $ 9.19
$ 9.19

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...

View full details
$ 11.49
$ 11.49 - $ 11.49
$ 11.49
$ 9.19
$ 9.19 - $ 9.19
$ 9.19
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 %
$ 16.29
$ 16.29 - $ 16.29
$ 16.29
$ 12.99
$ 12.99 - $ 12.99
$ 12.99

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...

View full details
$ 16.29
$ 16.29 - $ 16.29
$ 16.29
$ 12.99
$ 12.99 - $ 12.99
$ 12.99
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 %
$ 14.89
$ 14.89 - $ 14.89
$ 14.89
$ 11.89
$ 11.89 - $ 11.89
$ 11.89

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...

View full details
$ 14.89
$ 14.89 - $ 14.89
$ 14.89
$ 11.89
$ 11.89 - $ 11.89
$ 11.89
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 %
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59

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
$ 14.49
$ 14.49 - $ 14.49
$ 14.49
$ 11.59
$ 11.59 - $ 11.59
$ 11.59
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 %
$ 14.69
$ 14.69 - $ 14.69
$ 14.69
$ 11.79
$ 11.79 - $ 11.79
$ 11.79

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
$ 14.69
$ 14.69 - $ 14.69
$ 14.69
$ 11.79
$ 11.79 - $ 11.79
$ 11.79
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 %
$ 25.49
$ 25.49 - $ 25.49
$ 25.49
$ 20.39
$ 20.39 - $ 20.39
$ 20.39

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...

View full details
$ 25.49
$ 25.49 - $ 25.49
$ 25.49
$ 20.39
$ 20.39 - $ 20.39
$ 20.39
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 %
$ 28.89
$ 28.89 - $ 28.89
$ 28.89
$ 23.19
$ 23.19 - $ 23.19
$ 23.19

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...

View full details
$ 28.89
$ 28.89 - $ 28.89
$ 28.89
$ 23.19
$ 23.19 - $ 23.19
$ 23.19
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 %
$ 28.39
$ 28.39 - $ 28.39
$ 28.39
$ 22.79
$ 22.79 - $ 22.79
$ 22.79

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...

View full details
$ 28.39
$ 28.39 - $ 28.39
$ 28.39
$ 22.79
$ 22.79 - $ 22.79
$ 22.79
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 %
$ 28.59
$ 28.59 - $ 28.59
$ 28.59
$ 22.89
$ 22.89 - $ 22.89
$ 22.89

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
$ 28.59
$ 28.59 - $ 28.59
$ 28.59
$ 22.89
$ 22.89 - $ 22.89
$ 22.89
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 %
$ 24.99
$ 24.99 - $ 24.99
$ 24.99
$ 19.99
$ 19.99 - $ 19.99
$ 19.99

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...

View full details
$ 24.99
$ 24.99 - $ 24.99
$ 24.99
$ 19.99
$ 19.99 - $ 19.99
$ 19.99
Save 20% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 19% Save %
$ 11.29
$ 11.29 - $ 11.29
$ 11.29
$ 9.09
$ 9.09 - $ 9.09
$ 9.09

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...

View full details
$ 11.29
$ 11.29 - $ 11.29
$ 11.29
$ 9.09
$ 9.09 - $ 9.09
$ 9.09
Save 19% Save %
Foster BLH1B, 1/8" ISO-B Hydraulic Coupler x 1/8" Female NPT, ISO-B Series, Ball Lock, Brass
Save 20% Save %
$ 13.79
$ 13.79 - $ 13.79
$ 13.79
$ 11.09
$ 11.09 - $ 11.09
$ 11.09

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...

View full details
$ 13.79
$ 13.79 - $ 13.79
$ 13.79
$ 11.09
$ 11.09 - $ 11.09
$ 11.09
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 %
$ 18.29
$ 18.29 - $ 18.29
$ 18.29
$ 14.69
$ 14.69 - $ 14.69
$ 14.69

Foster K2B-104, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Silicone Seal, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2B-104 is a brass 1/4" plug in the FHK S...

View full details
$ 18.29
$ 18.29 - $ 18.29
$ 18.29
$ 14.69
$ 14.69 - $ 14.69
$ 14.69
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 %
$ 16.89
$ 16.89 - $ 16.89
$ 16.89
$ 13.49
$ 13.49 - $ 13.49
$ 13.49

Foster K2B-103, 1/4" ISO-B Hydraulic Plug x 1/4" 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 K2B-103 is a brass 1/4" plug in the FHK S...

View full details
$ 16.89
$ 16.89 - $ 16.89
$ 16.89
$ 13.49
$ 13.49 - $ 13.49
$ 13.49
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 %
$ 17.69
$ 17.69 - $ 17.69
$ 17.69
$ 14.09
$ 14.09 - $ 14.09
$ 14.09

Foster K2B-102, 1/4" ISO-B Hydraulic Plug x 1/4" 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 K2B-102 is a brass 1/4" plug in the FHK S...

View full details
$ 17.69
$ 17.69 - $ 17.69
$ 17.69
$ 14.09
$ 14.09 - $ 14.09
$ 14.09
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 %
$ 17.69
$ 17.69 - $ 17.69
$ 17.69
$ 14.19
$ 14.19 - $ 14.19
$ 14.19

Foster K2B-101, 1/4" ISO-B Hydraulic Plug x 1/4" 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 K2B-101 is a brass 1/4" plug in the FHK S...

View full details
$ 17.69
$ 17.69 - $ 17.69
$ 17.69
$ 14.19
$ 14.19 - $ 14.19
$ 14.19
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 %
$ 13.09
$ 13.09 - $ 13.09
$ 13.09
$ 10.49
$ 10.49 - $ 10.49
$ 10.49

Foster K2B, 1/4" ISO-B Hydraulic Plug x 1/4" Female NPT, ISO-B Series, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K2B is a brass 1/4" plug in the FHK Serie...

View full details
$ 13.09
$ 13.09 - $ 13.09
$ 13.09
$ 10.49
$ 10.49 - $ 10.49
$ 10.49
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 %
$ 9.99
$ 9.99 - $ 9.99
$ 9.99
$ 7.99
$ 7.99 - $ 7.99
$ 7.99

Foster K1S4, 1/8" ISO-B Hydraulic Plug x 7/16"-20 SAE, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K1S4 is a steel 1/8" plug in the FHK Seri...

View full details
$ 9.99
$ 9.99 - $ 9.99
$ 9.99
$ 7.99
$ 7.99 - $ 7.99
$ 7.99
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 %
$ 11.99
$ 11.99 - $ 11.99
$ 11.99
$ 9.59
$ 9.59 - $ 9.59
$ 9.59

Foster K1S-101, 1/8" ISO-B Hydraulic Plug x 1/8" 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 K1S-101 is a steel 1/8" plug in the FHK S...

View full details
$ 11.99
$ 11.99 - $ 11.99
$ 11.99
$ 9.59
$ 9.59 - $ 9.59
$ 9.59
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 %
$ 28.59
$ 28.59 - $ 28.59
$ 28.59
$ 22.89
$ 22.89 - $ 22.89
$ 22.89

Foster K1S/S-101, 1/8" ISO-B Hydraulic Plug x 1/8" 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 K1S/S-101 is a 303 stainless 1/8" plug in...

View full details
$ 28.59
$ 28.59 - $ 28.59
$ 28.59
$ 22.89
$ 22.89 - $ 22.89
$ 22.89
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 %
$ 25.59
$ 25.59 - $ 25.59
$ 25.59
$ 20.49
$ 20.49 - $ 20.49
$ 20.49

Foster K1S/S, 1/8" ISO-B Hydraulic Plug x 1/8" 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 K1S/S is a 303 stainless 1/8" plug in the...

View full details
$ 25.59
$ 25.59 - $ 25.59
$ 25.59
$ 20.49
$ 20.49 - $ 20.49
$ 20.49
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 %
$ 8.49
$ 8.49 - $ 8.49
$ 8.49
$ 6.79
$ 6.79 - $ 6.79
$ 6.79

Foster K1S, 1/8" ISO-B Hydraulic Plug x 1/8" Female NPT, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K1S is a steel 1/8" plug in the FHK Serie...

View full details
$ 8.49
$ 8.49 - $ 8.49
$ 8.49
$ 6.79
$ 6.79 - $ 6.79
$ 6.79
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 %
$ 10.59
$ 10.59 - $ 10.59
$ 10.59
$ 8.49
$ 8.49 - $ 8.49
$ 8.49

Foster K1BLV, 1/8" ISO-B Hydraulic Plug x 1/8" 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 K1BLV is a brass 1/8" plug in the FHK Ser...

View full details
$ 10.59
$ 10.59 - $ 10.59
$ 10.59
$ 8.49
$ 8.49 - $ 8.49
$ 8.49
Save 20% Save %

Request a Quote

Bulk and dealer pricing. Tell us what you need and we’ll reply within one business day.