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