Skip to content
Fall Ready Sale15% off everything through Oct 31FALLREADY15Tap to apply at checkout →
15% off through Oct 31FALLREADY15Tap to apply →

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 %
$ 772.00
$ 772.00 - $ 772.00
$ 772.00
$ 618.00
$ 618.00 - $ 618.00
$ 618.00

Foster K6B, 3/4" ISO-B Hydraulic Plug x 3/4" Female NPT, ISO-B Series, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K6B is a brass 3/4" plug in the FHK Serie...

View full details
$ 772.00
$ 772.00 - $ 772.00
$ 772.00
$ 618.00
$ 618.00 - $ 618.00
$ 618.00
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 %
$ 410.00
$ 410.00 - $ 410.00
$ 410.00
$ 328.00
$ 328.00 - $ 328.00
$ 328.00

Foster K4SLV, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4SLV is a steel 1/2" plug in the FHK Ser...

View full details
$ 410.00
$ 410.00 - $ 410.00
$ 410.00
$ 328.00
$ 328.00 - $ 328.00
$ 328.00
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 %
$ 492.00
$ 492.00 - $ 492.00
$ 492.00
$ 393.00
$ 393.00 - $ 393.00
$ 393.00

Foster K4S-103, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S-103 is a steel 1/2" plug in the FHK S...

View full details
$ 492.00
$ 492.00 - $ 492.00
$ 492.00
$ 393.00
$ 393.00 - $ 393.00
$ 393.00
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 %
$ 511.00
$ 511.00 - $ 511.00
$ 511.00
$ 410.00
$ 410.00 - $ 410.00
$ 410.00

Foster K4S-101, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S-101 is a steel 1/2" plug in the FHK S...

View full details
$ 511.00
$ 511.00 - $ 511.00
$ 511.00
$ 410.00
$ 410.00 - $ 410.00
$ 410.00
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 %
$ 591.00
$ 591.00 - $ 591.00
$ 591.00
$ 473.00
$ 473.00 - $ 473.00
$ 473.00

Foster K4S10, 1/2" ISO-B Hydraulic Plug x 7/8"-14 SAE, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K4S10 is a steel 1/2" plug in the FHK Ser...

View full details
$ 591.00
$ 591.00 - $ 591.00
$ 591.00
$ 473.00
$ 473.00 - $ 473.00
$ 473.00
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 %
$ 1,382.00
$ 1,382.00 - $ 1,382.00
$ 1,382.00
$ 1,106.00
$ 1,106.00 - $ 1,106.00
$ 1,106.00

Foster K4S/SLV, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S/SLV is a 303 stainless 1/2" plug in t...

View full details
$ 1,382.00
$ 1,382.00 - $ 1,382.00
$ 1,382.00
$ 1,106.00
$ 1,106.00 - $ 1,106.00
$ 1,106.00
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 %
$ 1,485.00
$ 1,485.00 - $ 1,485.00
$ 1,485.00
$ 1,188.00
$ 1,188.00 - $ 1,188.00
$ 1,188.00

Foster K4S/S-103, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S/S-103 is a 303 stainless 1/2" plug in...

View full details
$ 1,485.00
$ 1,485.00 - $ 1,485.00
$ 1,485.00
$ 1,188.00
$ 1,188.00 - $ 1,188.00
$ 1,188.00
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 %
$ 1,466.00
$ 1,466.00 - $ 1,466.00
$ 1,466.00
$ 1,173.00
$ 1,173.00 - $ 1,173.00
$ 1,173.00

Foster K4S/S-101, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S/S-101 is a 303 stainless 1/2" plug in...

View full details
$ 1,466.00
$ 1,466.00 - $ 1,466.00
$ 1,466.00
$ 1,173.00
$ 1,173.00 - $ 1,173.00
$ 1,173.00
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 %
$ 1,356.00
$ 1,356.00 - $ 1,356.00
$ 1,356.00
$ 1,085.00
$ 1,085.00 - $ 1,085.00
$ 1,085.00

Foster K4S/S, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4S/S is a 303 stainless 1/2" plug in the...

View full details
$ 1,356.00
$ 1,356.00 - $ 1,356.00
$ 1,356.00
$ 1,085.00
$ 1,085.00 - $ 1,085.00
$ 1,085.00
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 %
$ 410.00
$ 410.00 - $ 410.00
$ 410.00
$ 328.00
$ 328.00 - $ 328.00
$ 328.00

Foster K4S, 1/2" ISO-B Hydraulic Plug x 1/2" Female NPT, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K4S is a steel 1/2" plug in the FHK Serie...

View full details
$ 410.00
$ 410.00 - $ 410.00
$ 410.00
$ 328.00
$ 328.00 - $ 328.00
$ 328.00
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 %
$ 528.00
$ 528.00 - $ 528.00
$ 528.00
$ 424.00
$ 424.00 - $ 424.00
$ 424.00

Foster K4BLV, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4BLV is a brass 1/2" plug in the FHK Ser...

View full details
$ 528.00
$ 528.00 - $ 528.00
$ 528.00
$ 424.00
$ 424.00 - $ 424.00
$ 424.00
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 %
$ 614.00
$ 614.00 - $ 614.00
$ 614.00
$ 492.00
$ 492.00 - $ 492.00
$ 492.00

Foster K4B-103, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4B-103 is a brass 1/2" plug in the FHK S...

View full details
$ 614.00
$ 614.00 - $ 614.00
$ 614.00
$ 492.00
$ 492.00 - $ 492.00
$ 492.00
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 %
$ 637.00
$ 637.00 - $ 637.00
$ 637.00
$ 511.00
$ 511.00 - $ 511.00
$ 511.00

Foster K4B-102, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4B-102 is a brass 1/2" plug in the FHK S...

View full details
$ 637.00
$ 637.00 - $ 637.00
$ 637.00
$ 511.00
$ 511.00 - $ 511.00
$ 511.00
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 %
$ 654.00
$ 654.00 - $ 654.00
$ 654.00
$ 525.00
$ 525.00 - $ 525.00
$ 525.00

Foster K4B-101, 1/2" ISO-B Hydraulic Plug x 1/2" 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 K4B-101 is a brass 1/2" plug in the FHK S...

View full details
$ 654.00
$ 654.00 - $ 654.00
$ 654.00
$ 525.00
$ 525.00 - $ 525.00
$ 525.00
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 %
$ 509.00
$ 509.00 - $ 509.00
$ 509.00
$ 408.00
$ 408.00 - $ 408.00
$ 408.00

Foster K4B, 1/2" ISO-B Hydraulic Plug x 1/2" Female NPT, ISO-B Series, Brass

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K4B is a brass 1/2" plug in the FHK Serie...

View full details
$ 509.00
$ 509.00 - $ 509.00
$ 509.00
$ 408.00
$ 408.00 - $ 408.00
$ 408.00
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 %
$ 317.00
$ 317.00 - $ 317.00
$ 317.00
$ 254.00
$ 254.00 - $ 254.00
$ 254.00

Foster K3SLV, 3/8" ISO-B Hydraulic Plug x 3/8" 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 K3SLV is a steel 3/8" plug in the FHK Ser...

View full details
$ 317.00
$ 317.00 - $ 317.00
$ 317.00
$ 254.00
$ 254.00 - $ 254.00
$ 254.00
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 %
$ 469.00
$ 469.00 - $ 469.00
$ 469.00
$ 376.00
$ 376.00 - $ 376.00
$ 376.00

Foster K3S8, 3/8" ISO-B Hydraulic Plug x 3/4"-16 SAE, ISO-B Series, Plated Steel

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K3S8 is a steel 3/8" plug in the FHK Seri...

View full details
$ 469.00
$ 469.00 - $ 469.00
$ 469.00
$ 376.00
$ 376.00 - $ 376.00
$ 376.00
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 %
$ 391.00
$ 391.00 - $ 391.00
$ 391.00
$ 313.00
$ 313.00 - $ 313.00
$ 313.00

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...

View full details
$ 391.00
$ 391.00 - $ 391.00
$ 391.00
$ 313.00
$ 313.00 - $ 313.00
$ 313.00
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 %
$ 378.00
$ 378.00 - $ 378.00
$ 378.00
$ 302.00
$ 302.00 - $ 302.00
$ 302.00

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...

View full details
$ 378.00
$ 378.00 - $ 378.00
$ 378.00
$ 302.00
$ 302.00 - $ 302.00
$ 302.00
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 %
$ 387.00
$ 387.00 - $ 387.00
$ 387.00
$ 309.00
$ 309.00 - $ 309.00
$ 309.00

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...

View full details
$ 387.00
$ 387.00 - $ 387.00
$ 387.00
$ 309.00
$ 309.00 - $ 309.00
$ 309.00
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 %
$ 401.00
$ 401.00 - $ 401.00
$ 401.00
$ 321.00
$ 321.00 - $ 321.00
$ 321.00

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...

View full details
$ 401.00
$ 401.00 - $ 401.00
$ 401.00
$ 321.00
$ 321.00 - $ 321.00
$ 321.00
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 %
$ 856.00
$ 856.00 - $ 856.00
$ 856.00
$ 685.00
$ 685.00 - $ 685.00
$ 685.00

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...

View full details
$ 856.00
$ 856.00 - $ 856.00
$ 856.00
$ 685.00
$ 685.00 - $ 685.00
$ 685.00
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 %
$ 860.00
$ 860.00 - $ 860.00
$ 860.00
$ 687.00
$ 687.00 - $ 687.00
$ 687.00

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...

View full details
$ 860.00
$ 860.00 - $ 860.00
$ 860.00
$ 687.00
$ 687.00 - $ 687.00
$ 687.00
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 %
$ 774.00
$ 774.00 - $ 774.00
$ 774.00
$ 620.00
$ 620.00 - $ 620.00
$ 620.00

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...

View full details
$ 774.00
$ 774.00 - $ 774.00
$ 774.00
$ 620.00
$ 620.00 - $ 620.00
$ 620.00
Save 20% Save %

Request a Quote

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