Add me to the list... Add me to the list. I have had 3 leaks on the hot water side (all within just a few feet of the water heater) in the last year. Used one plumber for the first 2 times, then a different one when first one moved out of town. Both plumbers said it looked like a manufacturer's defect in the CPI Dura-Pex piping. My house was built in 2003 and it is in Fort Mill, SC. From what I have read here, it really sounds like a bad batch got through. I would be interested in a class action against Nibco, who bought this company and should be held responsible. I was also lucky to have been home every time the leaks sprouted, and avoided catastrophic damage to my home. But the plumber said it is probably going to keep happening until I replace all the defective piping. I may try replacing the 20 feet or so suggested in previous posts, and the plumber lowered the water pressure to 65 lbs thinking it might help some. Also suggested I replace the expansion tank, as it was full of water. Please contact me if interested in starting a lawsuit. Maybe if we get a decent number, all it would take would be a strongly worded letter from an attorney stating the number of parties involved to get Nibco to settle. Who knows?