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About 20 years ago, plastic tubing called polybutelyne or PB tubing was being introduced into new residential construction. The idea was great, but the plastic wall in the tubing was too thin and there were several mishaps after a few years of use and PB went away. Since then, a few new plastic products have been introduced, but there are a few states that still remember the PB incidents and won’t allow the use of poly tubing.Several years ago, plastic tubing called polybutelyne or PB tubing was being introduced into new residential construction. The idea was great, but the plastic wall in the tubing was too thin and there were several mishaps after a few years of use and PB went away. Since then, a few new plastic products have been introduced, but there are a few states that still remember the PB incidents and won’t allow the use of poly tubing.