wcj
Advanced Member
Time to winterize in Montana, thought I would share my method.
I installed a valve in the supply line from the water tank to the pump. The T connection is a 36 inch piece of tubing. Turning the valve selects water from the tank or water from the T connection. Turn the valve to the T connection, insert in RV antifreeze turn on pump and open valve on sink until it runs pink. Now open valve on toilet and run until pink. Done. Pump, toilet valve and lines are filled with antifreeze.
This also works as an outdoor shower. I installed a sprayer hose connection on the outside, fed through the pump. Set up the valve as outlined above except put the feeder hose in a two gallon container of warm water, instant outdoor pressurized hot shower.
I added the T valve about five years ago after having freezing issues a couple of winters. No issues since then.
Hope it helps