Manufacturer Name: Resideo Product Number: CPRD12 OEM Part Number: CPRD12 The Resideo CPRD12 True Zone Bypass Constant Pressure Regulator Damper is a necessary component for HVAC systems that aim to maintain ideal pressure balance. With a 12" round galvanized steel design, this bypass damper efficiently maintains air pressure by channeling excess airflow, assuring steady operatio... https://www.partshnc.com/cprd12-resideo-constantregbypassdamper12-rnd