It’s a great way to ensure its longevity if you are winterizing your pressure washer. To avoid water freezing in the pump winterizing is necessary as frozen water will permanently damage the pump. To keep the warranty intact, it is necessary to properly store your gas or electric pressure washer. The brutally cold winter months can permanently damage your pressure washer and sometimes destroy the pump and fuel system. The purpose of winterizing washer is to keep safe and secure the internal seals by keeping them lubricated while pressure washer is not in operation.