For this job, the issue was due to high water pressure to the home, and a failed thermal expansion tank. These issues caused the tnp valve on the water heater to blow and the master bathroom shower to leak from shower head. To fix issue we installed a new pressure regulator and thermal expansion tank to fix pressure issues. Then we also replaced the tnp valve on the top of the water heater. To stop the shower from dripping we replaced the moen 1222 cartridge in the shower valve. Once complete we waited for the water heater to heat up and tested the water pressure and set the new Prv to 65 psi. After testing our work we cleaned up and checked everything one more time. Thank you for choosing TE Certified.