Winterizing black tank flush

[ADK_Camper]

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.

[AaronV]

I blow mine out with the air compressor.

[stubblejumper]

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.

[Andy_F]

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

[ScottG]

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

[taviking22]

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.

[mbopp]

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