ClimateMaster 33B0006N20 Expansion Valve is a thermal expansion valve (TXV) designed to regulate refrigerant flow into an HVAC system’s evaporator. It responds to evaporator temperature and pressure changes, adjusting the refrigerant flow to maintain proper superheat and efficient heat transfer. This valve is commonly used in ClimateMaster geothermal heat pumps, air conditioning syste... https://www.partshnc.com/33b0006n20-climatemaster-expansion-valve-txv