Danfoss 067N8311 Thermal Expansion Valve (TXV) 7/8" x 7/8", TGHE-40, R410A is a precision refrigerant control component designed to regulate refrigerant flow in compatible HVAC systems. It works by sensing the evaporator outlet temperature and adjusting refrigerant flow to maintain proper superheat, ensuring efficient heat transfer and compressor protection. https://www.partshnc.com/tghe40-r410a-78x78-txv