Located gas leak at the pool heater and replaced a 1” steel nipple. Painted all above ground piping to prevent rust. Diagnosed a failed shower cartridge and replaced it with an OEM Kohler part. Installed a hub drain in the basement to serve an ice machine and bottle filler on the floor above. Installed two Grundfos recirculation tees. On is in the left sink of the master bathroom and the other is on the kitchen sink. I checked the valve inside of both units and made sure the settings were correct.