Winterizing black tank flush
I never did anything to winterize my built-in black tank flush (last two years). I thought it was self draining and would be ok. Fortunately I have not had any damage, but when winterizing this year...
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I blow out the black tank rinser then do the same with the entire fresh water system. I then pump RV antifreeze to the toilet. Have done this for the past several years without issues. The one year I didn't pump antifreeze I had the toilet valve freeze and crack.
