OTTO Excavator Parts Zx450-3 6Wg1T Thermostat Shell 8973889970 897388-9970 8-97388997-0 For Isuzu The OTTO Excavator Parts Zx450-3 6Wg1T Thermostat Shell with part number 8973889970 is a component designed for Isuzu engines, serving as a housing for the thermostat to support the regulation of engine temperature for optimal performance.