Hi Bruce,
Here is what I use.

The plumbing supply lines appear to be made of Polybutylene. Polybutylene is a plastic material used extensively during the 1980s and 1990s that has proven to be more prone to leakage than other types of supply piping systems like copper. Recommend reviewing any disclosure statements if available for comments on leaks in the water supply system.

A class action lawsuit has been filed regarding this material that requires the manufacturers to cover piping systems installed between Jan. 1, 1978 through July 31, 1995. For more information on the class action lawsuit, visit CPRC, Inc. (home page) , or call the Plumbing Claims Group at (800) 356-3496 for more information.