Winterizing the water supply plumbing on the toilet is one thing but I think the OP is asking about the black tank flush.... Most black tank flush systems are simply a separate city water connection which connected to a hose that runs to a spray head in the black water tank. Running antifreeze through the fresh water side of your Roo is not going do anything for the tank flush nor will connecting and air compressor since it's a separate line.
I could be wrong here but since the system is open on both ends, I wouldn't think any water would be trapped in there..
If you want to take extra precaution you can do 1 of 2 things:
1) The easiest is to connect an air compressor to the female hose fitting and blow all the water out of it.
2) Or you could run some anti freeze through it.... The challenge here is there is no pump so you'd need to allow gravity to create enough pressure to purge the water in the system and replace it with anti freeze. What you'd need here is a funnel with some hose attached to it and put the hose into the inlet, hold the funnel up high to create enough gravity to allow the anti freeze to displace any water.
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Gerry Z
2018 Forest River Heritage Glen 272RL
2018 Ford F150 Lariat 3.5 Ecoboost Max Trailer Package
Curt Trutrack WDH
HD Roadmaster Active Suspension
3200 Firman Generator/Inverter
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