There must be something to the oil vapor theory, as I worked in a 20+ y/o shop plumbed w/PVC air lines & the lines were always popping & breaking. No one was ever killed but it was a PITA. Fatigue from the vibration may also be a factor. I know other PVC systems not as old that are holding fine. I used black iron pipe on mine. Brian


My \'64\'s in the Gallery
Pictures in my Photobucket
1964 C10 Custom Cab 350/700R4
1964 Suburban 350/700R4
1979 Ford F350 4x4 400/c6