I have a new house and the shower was dripping when turned off. The plumber came and said I need a new cartridge even though the one installed was new. It was an American Standard R120 type P. All the rubber gaskets look just fine. After waiting 2 weeks they came with a new cartridge and installed it. The shower head still leaked in the same way as the other one...a series of drips and then it stops for about a minute and then another series of drips. What are the odds that 2 new cartridges would leak in the same fashion? Now I am waiting for a 3rd.
Anyone ever heard of this with American standard or other brands? Could the plumber got mixed up when removing the old and accidentally reinstalled the bad one? He is perplexed and said it has to be the cartridge. he also checked the water pressure and it is 50 psi which is OK. I also have another shower in the house with the exact cartridge and it does not leak.
any guesses as to what’s happening?