PVC = bad news for air lines. I did a very temporary setup with PVC. Then it was going on longer then temporary so I took it down and put up copper (still not the best). Each joint where I had used PVC cement fractured as I was disassembling it. Not just broke, but shattered in several small and very sharp pieces. This was brand new Charlotte Pipe PVC, manufactured in 2006 and installed by me in July 2006. Learn my lesson - sure did. There are several other threads here in the last year or so as well decrying the use of PVC and defining what are the best piping systems - and by real experts. Don't - it is beyond inexcuseable and is irresponsible if you have prior knowledge and possible illegal. If your air system injures someone and you are sued, this thread is public can be used as evidence.