The Nordyne 920668A Expansion Valve is an essential component in 2-ton HVAC systems that use R410A refrigerant (abbreviated R410A) and run at 50 Hz. This valve is made of copper for durability and serves an important role in regulating the flow of refrigerant throughout the system. https://www.partshnc.com/920668a-nordyne-2ton-r410a-rt6-expansion-valve