Speede55,
Just to be very clear about the word "Antifreeze" thrown around this thread. The only kind ever to use is specifically for motor home and other RV plumbing. It is also safe and proper to use for regular houses that get winterized. It is PINK in color and is stated on the gallon jug that it is specific for RV plumbing. It is non-toxic. It is sold in jugs identical to the blue windshield washer fluid. It is sold in places like Walmart's automotive department. If you have a home improvement center called Menard's, they run great sales on the stuff in the fall where it is free after rebate.
NEVER EVER use any other kind of antifreeze in your RV plumbing. Theoretically you could use automotive engine anti-freeze in your waste tanks, but there are serious environmental violations along with the unknown of how the waste valves and such are compatible with it. Use only the RV pink jug stuff and you will never go wrong.
I do wonder if any of you who keep your motor home outside in winter just blow out your fresh water lines and traps and do without antifreeze. Maybe a little water remains in the on-board water pump with concern of damage.
The current-day design of the Phoenix Cruiser has some kind of easy winterizing method where you add the pink antifreeze through the city water connection with a winterizing setting as demonstrated
HERE at minute #6:00
