For those with a Flow Pur whole house filter you may want to consider a by pass plate. It will save about a quart of anti freeze with each winterization. Take the filter element out and install the plate before sucking in the pink stuff.
Winterizing By-Pass Plate - RV Wholesalers Parts Store
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2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054