Originally Posted by
Michael Larson
While the cold water only marking surprised me I understand why it's there. The threaded portion of the transition fitting is not suitable under pressure and temperature conditions combined.
Michael,
That's not the reason given for them not being suitable for that use.
I don't think there is a real problem with using it for the TPR discharge as the CPVC is approved for that use and you have to use a transition fitting of this type to be able to use the CPVC pipe which is not under high pressure(not closed system) when called upon to discharge the water. JMHO
That's not what was being stated. What we all have been seeing are "adapters", not "transitions".
In the slide show Joshua linked to, "transitions" are shown on slide 10 (which I have attached).
When connecting CPVC to metal, a "transition" is required, not an "adapter".