Quote:
Originally Posted by ProfChuck
Yep, that is exactly what it does. To correct the situation you need to put "check valves" (antibackflow valves) in BOTH the hot and cold water lines going to the shower valves (only on those lines - don't try to do it to the whole system). They are relatively inexpensive to buy and will solve the problem. Only caveat is you may get a bit less pressure since the valve may push a little against the water flow. They work well if you put them in.
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Its my experience to just live with it.. If you add the so called check valves as suggested then your low point drains will not work.. Water will be retained in the lines.. ( Like putting your finger over a straw)
Hate to see anyone have freeze up issues from not being able to winterize properly..
You have been warned... LOL