Karcher pump guard is specifically formulated to prolong the life of your pressure washer. This specially formulated solution will protect your pressure washer from corrosion, premature wear & freezing (down to -25 F). it also adds lubrication to your pressure washer's valves & seals to prevent sticking in the future. Ordinary anti-freeze is insufficient in this respect & is not recommended. Works with all Karcher electric & gas powered pressure washers. Put your guard up today. Compatible with most consumer gas and electric pressure washers.