Universal Rite Fit 15" 5.5kW Flo Thru Incoloy Heater (27 J0519 7S K) airbuttonparts Confirm compatibility with the Rebel Confirm compatibility with the Rebel cleaner model before installation to maintain proper fit and travel geometry A gasket of this size and location is useful because it helps preserve the integrity of a major internal connection point that affects how confidently the filter can be reassembled and returned to service 5kW Flo Thru Incoloy Heater (27 J0519 7S K) is engineered for Universal Rite Fit replacement applications and helps return the spa to stable 5kW heating output and 15" heater length should be matched to the original equipment requirements before installation