Do we have to winterize if we use our RV during the winter?

atreis wrote:
PEX probably isn't going to burst, but the plastic elbows and other fittings will if they happen to have enough water in them.

Theoretically, yes, but in practice I have yet to see one crack. The elbows dont contain a lot of water, it is a very small diameter pipe inside so much less pressure than would be on a bigger inside dia pipe fitting. 3/8 pipe fittings are small, even 1/2 might be small enough, bigger ones I am sure would prob crack. Most RVs are 3/8 that I have seen.