Quote:
Originally Posted by Trkyte@msn.com
I have been corrected by my camping friends. It is used during cold weather dry camping. The black tank has a heater but the crossover pipe would still freeze. By closing that valve the pipe will be empty until you get a chance to dump. So much for the dealers explanation!
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I have the valve at the black tank but no black tank heater. I don't think this explanation is any good.