The ClimateMaster 33B0002N03 Thermal Expansion Valve is a precision refrigerant metering component designed to regulate the flow of refrigerant into the evaporator for optimal cooling performance. It automatically adjusts refrigerant flow based on system load and temperature, helping maintain efficient heat transfer and consistent operation. Commonly used in ClimateMaster geothermal h... https://www.partshnc.com/33b0002n03-climatemaster-thermal-expansion-valve