1) Fix the shower valve into the wall with screws. Use a level to ensure that the valve is straight and level. (Important: Flush the water supply pipes to remove any dirt and debris before installing the valve body)
2) Wrap Teflon tape around the pipe thread. Connect hot and cold water supply lines and all the in-wall pipes(not included) as desired to the valve. Turn on the water supply and open the cartridge to check for leaks. Then, put on the protective cover.