Hard to believe I'm already thinking about closing but it's only 6 weeks away
Anyways, every year I struggle with plugging my lines after blowing them out. Maybe I'm anal, but when i blow then plug them with the threaded plugs, I can always see tiny air bubbles until I turn off the blower (from the pump). Yes, the bubbles disappear once I turn off the blower, and this is where I get anal, but the way I see it, if I get small bubbles with the blower running, it means there is an air path somewhere that could potentially let water into the pipes over the winter.
So I have a new thought this year. I purchased a #7 rubber plug that fits into the return lines beyond the fitting (into the pipe). It fits in the return pipe such that I can also install the threaded plug over it (seems like overkill, I know). Since I think the air bubbles are coming from somewhere in the return fitting/plug connection, the #7 rubber expansion plug will bypass that problem. However, here is my concern.....once I put the rubber plus in, there is no way for me to continue blowing the water out of that return, so that when I install the threaded plug, there will be water between the threaded plug and the rubber plug. So, should I be concerned about the water in between those 2 plugs freezing and compromising my return fittings?