I have American Standard shut offs to my shower. I have replaced both valves with American Standard part number 11-4300 cold and 11-4300 hot. I have double checked the tightness of the installation at the pipe and tightness or the actual shut off on the valve. Immediately following the installation all was good. A few hours later the drip from the shower head resumed. I have not had any other changes to my water system to the house and the new replacements are the same as the old valves. What should I do next?

Did you replace the parts for the same drip that you now have? If not why did you do the replacement? Any more information? Back to you, Tom