I am replacing a 30+ year old shower valve as part of a master bath remodel. The existing shower valve has 1/2" NPT female ports (qty 4), with one port capped. The new valve has 1/2" NPT male connections (qty 3). I have these fittings in my possession:
I'm just wondering if these are acceptable for this application.
A local big box store also (supposedly) has these fittings available:
which do not have the nut and gasket. Are they both allowed? Is one better than the other?
I'm in Gwinnett County Georgia, USA.
Best Answer
From what I can gather, both fittings are acceptable. I ended up getting the second style, and after installation, there was a very small leak at the NPT thread. I could not tighten it, since the CPVC does not rotate relative to the copper. So, I had to cut the line tighten the fitting and then install a CPVC coupling. Not a big deal, but had I installed the first type of fitting, I could have loosened the nut, tightened up the NPT joint and then tightened the nut. Which I suspect is exactly the problem these fittings are meant to address.