The Rheem SP21092J 2 in. Appliance Adaptor to Flue Collar is designed to facilitate the connection between your water heater and the flue system. This adaptor ensures a secure and efficient transition, optimizing venting performance. Constructed from durable materials, it meets industry standards for safety and reliability. The 2-inch size is compatible with a variety of Rheem water heaters, making it an essential component for both new installations and replacements. Enhance your water heating system's efficiency with this reliable adaptor.