DownTheAvenue wrote:
You can try blowing air through the system but that is not fool proof.
How exactly is using compressed air to winterize not foolproof, or at least any less foolproof than pumping antifreeze through the pipes? Air doesn't freeze and expand, any more than RV antifreeze freezes and expands. Any slight hint of moisture left in the low points in the plumbing has plenty of space to expand and doesn't burst the fittings. Both are perfectly sound approaches towards winterizing an RV, and there are many, many RVers who use each with success every year.
Seasonal homes and camps with plumbing systems are typically winterized by blowing the water out of the pipes with air (if they aren't designed and built in such a way that the system can be drained by gravity). Many of them have metal pipes that are far more likely to burst if water freezes in them than are the PEX pipes used in RVs.
