I was the one who first reported this problem here - see above. I had 3 of 9 valves fail and have since replaced them all. Brasscraft asked to test one of my faulty valves and, since I had three, I sent them one along with two good ones from the same installation (all had same manuf. lot nos.). They said they would have results in a couple of weeks. After many months of correspondence with BrassCraft, they were horribly uncooperative. I kept following up asking for the results, and they kept stalling telling me that they had not tested them yet. Then they claimed that they lost the test results. Sure. They likely determined that it was a manuf. defect and didn't want me to spread the word. The leak was under a kitchen sink in a 3rd floor rental flat of a 4 story condo bldg. where the tenant had been gone for a month. We discovered leak by noticing a pool of water in the subterranean garage on Christmas Eve. It had leaked probably for day or so, causing little damage to the rental unit, but the unit below it sustained a lot of damage (those resident owners were out of town too about 300 miles away for the holidays). I was able to get in and stop the leak in the rental unit by shutting down the supply to the unit and had to call the plumber for emergency repair. I immediately notified the resident owners by telephone and they were not pleased nor are they pleasant people to deal with in any situation. The resident owners did not come home until 10 days later and their windows were closed the entire time. They moved out for months while they negotiated with our insurance company for the brand new $85K kitchen they always wanted. They worked it. It was a dilemma for them though. If we did not have insurance, they would have asked us to pay and I would have pointed the finger at BrassCraft. Thus, unless BrassCraft paid, it would have turned into a case where they sued us and BrassCraft and prove that BrassCraft valves were defectively made - which may have been a very expensive legal case with experts, etc. A good lawyer may be able to get enough evidence in discovery to prove the defect, with help in part from the info. on this thread. I happen to be a lawyer myself and was hoping by starting it, others would come forward with their evidence of defective valves too. Hopefully, others will benefit from this thread. BrassCraft was not forthcoming with any information. Sadly, if insurance won't cover the damage, you may have to sue them to get it in discovery. They did offer to pay for the 9 valves. Big of them.