You are the first to respond to my post that incurred a similar problem with cracked Brasscraft angle valves. Three of these cracked on me about 18 months after installation by a professional plumber causing leakage and damage. Unknown to me, my remodel contractor installed 9 of these which have all been changed. They were all stamped with TK09, which I believe is a Brasscraft date code. I sent one cracked one and two uncracked ones back to Brasscraft in Dec. 2011 and they opened a claim number. They promised me test results, but after repeated requests, they have reported nothing. I sure would like to know more about these faulty valves, but Brasscraft has been less than forthcoming. They really have caused me grief and my neighbor underneath too.