I just bought one at Walmart for $2.xx.
Some years we don't have freezing weather here in Pensacola, so last year I decided to just turn on the camper heater on nights it was scheduled to drop too low. That was a mistake, we had freezing nights more than any winter I can remember in over 30 years, probably close to twenty of them! This year I decided to at least do minimal winterizing. (Probably won't freeze this winter.)
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