Customer had leaking 40 short gas water heater. Installed a new 40 short gas with a new thermal expansion tank, pan, wag valve (to meet code requirements for having another unit below), and shutoffs. Adjusted the slope of the vent to allow better venting. Recommended having hvac tech inspect the 6 inch tee the vent ties into. A wye is the recommended connection to allow flow of the exhaust to safely vent away. Made customer aware that if the wag valve gets wet and shuts off, it can’t be reused and additional pricing will be necessary to replace the valve. Also made customer aware that there is grey poly piping coming out of the wall above cold line in water heater. Customer is aware and has replaced most of the poly in the home already.