i did a rebath northeast tub to shower conversion almost 1 yr ago..in 2016. over the past couple of weeks i have notised that when i shut the shower off, the shower head leaks for more then 10 minutes. so i read of possible causes on the internet...it said try moving the regulator. that worked for a few days then it was back to leaking water for more then 10 minutes. a plumbing friend said it could be the cartridge. my friend deals mostly with moen products. he said they give a lifetime warranty on parts and he is sure delta does as well but that he wasnt a 100% sure. so i called rebath, described the issue and the service guy said cartridge. i was ok. he sent a guy out and replaced the cartridge and all is well.. thanks, rebath northeast.