Professional Grade, Professional Warranty. Kärcher's entry level, professional grade, cold water pressure washer is ergonomic, mobile, powerful and compact: The HD 4/10 X Classic high-pressure cleaner impresses with its durable and reliable professional components such as the brass cylinder head, three-piston axial pump, stainless steel pistons, induction motor, stainless steel lance and heavy duty wire-braided hose, as well as its compact and robust design. The automatic pressure relief system effectively protects the hydraulic components, allowing for longer operating periods and ensuring a long lifetime and very low repair and maintenance costs. Kärcher’s Professional range is perfect for use in a commercial environment, or for home users looking for extra performance and durability.