Winterizing with the pump and winterizing switch?

[Overlord]

Even a slight air leak at the hose washer keeps the pump from drawing the antifreeze up the hose. Elevating the jug so there is less of a column of fluid to lift also helps. I usually pull my truck up next to the rig and set the jug on the tailgate. Some folks have had success with using two hose washers to make the seal better.