Pentair 474201 Combustion Chamber O-Ring KitPentair 474201 Combustion Chamber O Ring Kit Ensure a secure and reliable seal for your Pentair pool heater with the genuine Pentair 474201 Combustion Chamber O Ring Kit. Product Features: OEM Pentair replacement part for combustion chamber sealing Designed for use with select Pentair MasterTemp and Sta Rite Max E Therm pool and spa heaters Kit includes all necessary O rings for the combustion chamber assembly Ensures leak free operation and optimal