Customer was having issues with back hose spigot. Checked pressure at double water heater pipe and series. PSI approximately 78. Home is only six years old and pressure valve was manipulated for higher pressure. No thermal expansion tank found in utility closet with water heaters. When searching for winterization valve for back hose spigot found thermal expansion valve in basement bathroom. Explain the issues with these valves and gave estimate for 5 gallon thermal expansion tank installation. Showed customer where winterization valve was turned off underneath kitchen sink.