STBRetired wrote:
I don't worry about the black and grey tanks themselves. But I do worry about the length of pipe between the tank and the gate valve. I waste about $3 (sorry DrewE) and pour a gallon of antifreeze into the tanks (1/3 in grey, 2/3 in black) to make sure that those lengths of pipe do not freeze and crack.
An alternate approach that also works fine is just to leave the dump valves open (obviously having emptied the tanks first) while winterizing and maybe for a half hour or whatever afterwards, so that whatever water etc. is displaced has a chance to drain out.
I certainly am not going to lose a bit of sleep over your (or anyone else's) putting antifreeze in the holding tanks, though. Whatever the process, I sincerely hope your RV survives the winter in great shape and you have lots of good times next year.
