I have done some plumbing work from time to time, so is electrical. Some of people ask me which is better for water piping, usually the copper is best, it is durable, last forever, would outlive human being lifecycle. Has almost no known side effect on health from using copper pipe as compared as CPVC which now banned by plumbing code that used to be water pipe, found to cause cancer. There is new plastic tubing, with brand "Sharkbite" Because of what happened with CPVC, I am not sure about this new plastic tubing. State of Maine banned that one too. But for pipes used to get rid of shit, PVC is fine.