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Ralph Mowery[_3_]

In article ,
says...

Sounds dubious to me. I can see it as a requirement if the shower/tub is being replaced,
it's a bathroom remodel, etc. But not if it's just that the old valve needs to be replaced.
And whatever it is, it's always up to the local or state authority that has jurisdiction as
to if it's OK or not.

I hate those one valve showers. Seems that the mix is often too cold
for me . Especially in the winter time where the incomming water is
much colder. I would rather take my chances of the water comming out
too hot. As long as you tell others in the house not to use the water
it is mostly safe.