A.Dan Friedman responds: Polybutylene (PB) piping has been used since the mid-1970s for water supply and in-house supply piping. Two types of PB piping failures have led to class-action lawsuits against PB plumbing manufacturers: leaks due to improper installation and leaks due to defective materials.

Early failures were found in Celcon acetyl-plastic insert fittings (tees and elbows) used for connections. A portion of the insert fitting is inserted into the pipe and then clamped in place using an aluminum or copper crimp ring over the outside of the pipe. Leaks have also occurred with the more recent copper and brass insert fittings. While...

or Register to read the full article.