FVIR (Resistente all'accensione a vapore infiammabile) o FTR rilascio termico fisso
Water Heater FVIR (Flammable Vapor Ignition Resistant) FTR Fixed Thermal Release. Compatible with most water heaters. Part fits almost all Rheem NG water heaters 40 to 60 gallons. Part is Interchangeable (Will fit most models).