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I just use antifreeze. I don't have an air compressor and just don't see a need for that step. When you pump antifreeze through the system and make sure you open every valve until it flows red then you have replaced all the water with antifreeze. Been doing it for 40 years where it gets to 0 and the only problem I've had is when I forgot to flush the toilet. Fortunately it just broke the valve, not the toilet.
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Earl
2007 33.5' Arctic Fox Fifth Wheel used for full-timing for several years--now sold
2011 Hideout 23RKSWE that we now use for poking around local parks
2007 Chevy 3/4 ton diesel with Prodigy Brake Control
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