I needed to replace the drain valve on my hot water tank (dripping). When I
removed the old one I noticed that it was white plastic but the drain pipe
in the tank is some form of metal, guessing copper. My question is this:
would I need to put any plumbers tape on the plastic drain valve or should I
leave it be? I have installed it without tape, seems okay, but I'm
wondering if it might fail in the future.
A second question: would it be better to replace the plastic drain valve
with a copper one? My fear is that without knowing what metal the drain
pipe is, putting a copper drain valve might cause some problems.
As always, thanks!
I know the truth is out there but I like to stay in...
If the plastic valve isn't leaking now, chances are that it will last
until it is opened again. These cheap valves are designed to be used
only once -- at the end of the heater's life. If you intend to
periodically flush out the tank (extending its life), replace the drain
valve with a brass one. Most likely the opening in the tank is 3/4"
pipe thread. Seal the new valve with Teflon tape or pipe dope.
Right on about the plastic valves being crap. I took my old one apart and
found a flimsy o-ring at the end of the stem is all there is to the valve
and it had come off, ergo the leak. There really isn't a whole lot there to
instill any confidence that it would hold back 50 gallons of hot water!
Thanks for the suggestions, guys. I really appreciate them all!
I put a brass hose cap at the end of my valve. I don' t know why these
valves always leak, but it seems like a simple fix to just put a cap.
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