Karcher High-Pressure Hose Extension For K2, K3, K4, K5

For the Karcher K2, K3, K4, and K5 pressure washers, you need to know that they all have a proprietary connection which will limit your attachment options. But, don’t worry, I’ve done all the legwork to get you what you need in this kit.

If you’re looking to use an aftermarket sprayer like my

Original Mosmatic Swiveling Sprayer

with the K2-K5, you’re going to need this hose extension with this specific Karcher adapter.

Also, you will not be able to replace the OE hose. You can only extend it with a High-Pressure hose. 

Specifications

High-Pressure 3/8″ Pressure Washer Hose

– ⅜” Inside Diameter

– ⅝” Outside Diameter

– Ends terminated in ⅜” Male NPT

– Single Wire Construction

– Smooth Jacket in Non-marking Blue

– Rubber Bend Restrictors

– Max Pressure: 4000 PSI

– Max Temperature: 275 °F

– Warranty: 60 days, for manufacturing defects

Stainless Steel 3/8″ Female QD Coupler

– Brand: MTM

– Material: Stainless Steel

– Inlet: ⅜” Male NPT

– Outlet: ⅜” QD Coupler

– Warranty: 60 days, for manufacturing defects (does not include o-rings).

Karcher Adapter

– Brand: Karcher

– Material: Brass and Plastic

– Inlet: Karcher Press-in Type Fitting

– Outlet: M22 Female (14mm)

Brass M22 Male (14mm) to 3/8″ Male NPT – Twist & Seal

– Brand: MTM

– Material: Brass

– Inlet: M22 Male (14mm)

– Outlet: ⅜” Male NPT

– Warranty: 60 days, for manufacturing defects.

Stainless Steel 3/8″ Female QD Plug

– Brand: MTM

– Material: Stainless Steel

– Inlet: ⅜” Female NPT

– Outlet: ⅜” QD Plug

– Warranty: 60 days, for manufacturing defects.

FAQ & Support

Why is my 3/8″ coupler leaking from the end?

How do I install or uninstall these quick disconnects on my hose? Did Paul Bunyan torque these down!? 3/8″ Coupler and Fitting Install.

Pressure Washer Fittings 101: Fittings and QD Naming

Pressure Washer Fittings 102: Applications and Usage

Pressure Washer Fittings 103: Spray Nozzles