The Rheem RTG20319CS Combustion Test Port Cover is designed for use with Rheem tankless water heaters. This essential component ensures proper combustion analysis by providing a secure cover for the test port. Made from durable materials, it fits seamlessly into the existing system, maintaining compliance with industry standards. Its compact design allows for easy installation and removal, making it a practical choice for maintenance and inspections. Ideal for HVAC professionals and technicians, this cover is a must-have for ensuring optimal performance and safety in gas-fired water heating applications.