My dealer recommended turning the screen backwards, to depress the back flow preventer, when drawing in the antifreeze during winterizing. Said that it pulls in better that way, as the pump doesn't have to overcome the spring. Just remember to turn it back, after winterizing.
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Be Safe, and Everyone Goes Home,
Rick
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter
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