OTTO Excavator Spare Parts Nhr55 4Jb1 Thermostat 8973617700 897361-7700 8-97361770-0 For Isuzu This OTTO Excavator Spare Part, the Nhr55 4Jb1 Thermostat with part number 8973617700, efficiently regulates engine temperature for Isuzu engines, ensuring optimal performance in your machinery.