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Old 02-10-2016, 12:56 PM   #11
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Same here

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Old 02-10-2016, 01:08 PM   #12
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I blow mine out along with fresh water fill.


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Old 02-10-2016, 01:19 PM   #13
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I never gave it a 2nd thought when winterizing but bubbles post above helps ease my mind.
I'm curious, how would one get antifreeze in there if you did want to winterize it?
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Old 02-10-2016, 01:51 PM   #14
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I would be more concerned with a "closed" system than an " open" system. With trapped water in a "closed" system the water has nowhere to expand to... and something will crack, hence the use of RV antifreeze. With blackwater flushes, check valves and spray bars, this is an open system with the effects of gravity and no resistance to water just laying in the tube. I don't believe the amount of expansion of a drop of water here will matter.. lots of air space.

I used to just blow the lines with air on my PUP that had a shower /toilet combo and after 13 years never an issue.
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Old 02-10-2016, 04:01 PM   #15
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I live here in the great white north where it gets down to -30C and lower. Never crossed my mind to winterize it and have not had a problem , "yet"
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Old 02-10-2016, 05:26 PM   #16
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I pump anti freeze out my outside shower then attach that hose to my black tank flush and pump the anti freeze though the black tank flush.
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Old 02-10-2016, 11:48 PM   #17
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Never had a problem. Seems to take care of itself
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Old 02-11-2016, 05:23 AM   #18
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Iuse a pressurised canister to force AF thru the flush line, also thru the city water connection, and the fresh water tank fill line, then use the suction line and 12v pump to do the rest of the system

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black, black tank, black tank flush, tank, winter, winterize

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