Returned and replace customer’ Delta shower cartridge in the primary bath. When testing for proper operation found that the hot and cold lines appear to be flipped in the wall. Shut the water back down and drained the system. Flipped the cartridge in the valve so that hot and cold are properly oriented on the temperature handle. Noted to customer that the shower head is leaking fairly having from the towing in the shower head where you swivel the head to adjust the type of spray. Other than the shower head, all work tested properly with no leaks.