2500 PSI 6.5 hp Briggs and Stratton gasoline engine 2.4 GPM I have a Campbell Hausfeld pressure washer that I bought at Tractor Supply about eight years ago. It works fine. I need to use it out doors this winter where it may be exposed to freezing weather. When the washer is shut down does the pump drain itself to avoid freezing or is there a drain plug on the pump where I can physically or manually drain the pump?