As I am about to embark on a building/plumbing project, I have been investigating the pros and cons of copper, cpvc and pex. I am totally sold on the pex, except for the fact that i can't get a great answer as to turning 90 degrees in perpendicular 3 1/2" walls. It appears that trying to "bend" the pipe, doesn't work so well. Some have recommended cutting and using elbows which seems to defeat some of the advantages of pex. What is the solution?