Another Winterizing Question

My son had to replace the toilet water valve because of a lapse in judgement one September night.

Depending on the amount of freezing, I am usually most concerned about the non-pex parts, such as the pump, and fittings. The pex might expand enough to allow freezing, but I wouldn't count on it. Of concerh are the drain lines for the waste tanks, those pipes are big enough to contain a lot of water which if frozen would most likely crack the pipes and valves. The tanks thenselves probably have enough space that bursting would be improbable. Personally, I hope that I never have occasion to determine an accurate answer to your question!

The tubing holds up well as it will expand if frozen. What does NOT hold up is the hard plastic unions and elbows and "t's" that interconnect the tubing. They do not expand and then crack. Doug

I may be wrong but I think it is more about the fittings than the hoses.