A Mid-to-Upper Range Kärcher Pressure Washer with Home Kit and Water-Cooled Induction MotorThe Karcher K 4 Power Control Flex Home Pressure Washer — also known as the K 4 Power Control Flex Home, K4 Power Control Flex Home and K-4 Power Control Flex Home — is a highly capable mid-to-upper tier model in the Kärcher Home & Garden range. It offers a strong performance upgrade over the K 2 and K 3 s..