burst pipe protection?

Harvard wrote:
I see little value if only because you are going to need to winterize anyway because of the valves and other places where the foam core is not going to protect.

I do have a spot that's hard to get the water out of, and I prefer to blow out rather than use antifreeze. It might help there. It might also help for those who want to extend the season and worry about getting caught in unexpected deep freeze weather. I do worry about the flow restriction, but if you used it in only a few critical spots, it might help.

My RV is so old, it uses only flexible copper tubing (not rigid pipe). I suspect it won't fit in that narrow diameter tubing.