The Rheem AP20947D Characterization Plug is designed for Heat Pump Water Heaters (HPWH), allowing for precise diagnostics and performance assessments. Constructed from durable materials, this plug ensures long-lasting reliability and compatibility with various Rheem HPWH models. It provides easy access to critical system parameters, making it an essential tool for both technicians and homeowners. By enabling accurate monitoring, this characterization plug helps enhance the efficiency and performance of your water heating system.