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Old 10-12-2016, 03:40 PM   #1
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Winterize by Vacuum?

I was getting ready to winterize using low pressure compressed air and I had a co-worker tell me he's been using a wet/dry vac to winterize his rv. He says he creates a seal around various drains and operates all associated valves, then dumps rv antifreeze in the traps.

Anyone heard of this method?

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Old 10-12-2016, 03:52 PM   #2
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Where is he attaching the wet/dry vac to? Is he trying to pull the water through the city water hookup?

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Old 10-12-2016, 04:09 PM   #3
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Only place I'd think to use a wet-vac would be to clean a P trap to avoid diluting the strength of the plumbing A/F , and I'd have to be expecting EXTREME cold to do that.

JMHO: Stick to your plan and use compressed air (30 PSI) and remove the 12 volt pump to store it inside at home , because with no RV anti freeze in it , even running it dry may not be enough to protect it from freezing. Blow back to the fresh tank, from the pump connection, to be sure its drained.
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Old 10-12-2016, 04:16 PM   #4
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He was attaching to the drains under the rv.
Thanks for the 30psi quote, that was my next question
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Old 10-12-2016, 04:28 PM   #5
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I hope he was not hooking the vacuum to the dump hose!

I use 45 lbs of air. City water pressure is about that so the extra pressure and volume may blow more of the water in any low points out.
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