Our FlowGuard pipe sprung a tiny spray leak within a wall behind the shower head. Soaked the wall and had to break in and get plumber to replace section of defective pipe. Home built in 1997 in Scottsdale, AZ. I too am concerned about how much pipe we have within the walls and what a disaster it would be to have similar leaks. My understanding is that there are a lot of homes that were built with FlowGuard pipe that have had such problems. I saved the piece of the defective pipe that developed a spray leak. Would like to compare notes with people with similar issues and see if we can get pipe manufacturer to replace defective pipe.