I have an '85 Single Wide. Complete with polybutylene. I've already replaced two joints with Gatorbite. One 90 elbow and the other was a nightmare. A tee failed. It was located over a/c ducting under a joist. I couldn't simply cut and replace with a new tee because of working space and no line of sight to see what I was doing. So I constructed a cpvc tee and spliced that in with 3 Gatorbites. Both were on the hot water. I have well water so chlorine or flourine is not to blame. Rather than replace each joint as they fail I decided to repipe with cpvc. It's readily accessible here and I'm familiar with it. What I don't know how to do is the union between the supply which is pvc and the new cpvc. Should I make a threaded joint or use the 3/4" pvc/cpvc coupling which is sold at both box stores here. Can someone recomend a good DIY plumbing book? Something that touches on details like this and other items the might come up like how to hang it and account for expansion.