Winterizing black tank flush

Question

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 I inspected some of the plumbing visible in the compartment that houses the water pump and saw that there are some elbows that definitely could trap water.  My qustion is:  Do ouy winterize your black tank flush, and if so how do you do it?  The only simple option I can think of is to use a funnel and pour antifreeze into the inlet.

mbopp · Answer

I just blow mine out with a compressor for a few minutes. The fresh water system gets "pinked."

taviking22 · Answer

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.

scottg · Answer

Rats, now I'm trying to remember if I blew the black tank rinser out.

andy_f · Answer

I put antifreeze in mine.  Here's what you'll need.  Also works for winterizing the city water connection.

stubblejumper · Answer

After I finish winterizing I just push on the check valve stem in the hook up and a little Stream of pink squirts out, so I am assuming that the line gets filled in the process. Have never had a problem or freeze up.

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Winterizing black tank flush

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