Hello from Colorful CO

+1, to me it is like the old philosophy of putting your spare batts in a fridge. Old school.

Originally posted by GlueGuy Originally posted by jato  Lastly I pull out both our 12v deep cycle group 24 batteries and place on the cement floor in our unheated garage.  I will give each a 2 amp trickle charge, this will take about 1 day / battery to bring to full charge. I don't know if it's an issue or not, but I have read in various places that it's not a good idea to store lead acid batteries on concrete; especially in a climate where it's below freezing temperature. Based on this, I never put the batteries directly on the concrete, but put a block of wood (like a piece of 2x6) under each battery under my workbench.

That was my understanding years ago also.  I think it is OK now with the plastic cases but I can't bring myself to put them on concrete either.

I will add that when I finally got to the water pump and HWH, I discovered a bypass line with no bypass valve. 😖😮🤔. I know a little about piping configurations since I've been in power plant operations for 33 years. I also learned that Home Depot, Ace and Walmart are limited on RV plumbing parts and Canping Workd is closed on Sunday. Dang! It'll wait a day.
Thanks again!

Appreciate the comments on air pressure.  That being said, I make sure 1 line is always open so that you don't get a huge buildup of air pressure in the line, and causing a potential problem!  My neighbor uses 90 PSI in his 5th wheel when he winterizes but always keeps a line open.  He told me a couple days ago: "I've been doing it this way for over 25 years and have never had a problem."  I tend to be a bit more cautious than my neighbor and the end result has been the same, no problems.  I did forget to mention that (like Stephen H posted) I also put a little bit of rv antifreeze in the toilet bowl to keep the seals wet and lubricated.

Two years ago I just blew out the lines and I ended up having to replace the toilet valve, which developed a hairline crack and sprayed a fine mist on the wall behind the toilet when I dewinterized.  It only cost about $30 for the parts and I fixed it myself, but it wasn't the way I wanted to spend a Saturday morning.

What happend to me may have been a fluke, but antifreeze isn't expensive.  When I dewinterize I disinfect the potable tank and the rest of the system with bleach, but before that I run a tank full of water with vinegar through the lines -- then the bleach.  I don't have an issue with the taste of antifreeze in the water.

All that said, just blowing out the lines will obviously work most of the time if you do it right.

TT