OTTO Excavator Parts Npr66 4Hf1 Thermostat Cover Gasket 8973007930 897300-7930 8-97300793-0 For Isuzu The OTTO Excavator Parts Npr66 4Hf1 Thermostat Cover Gasket, with part number 8973007930, is a component designed for Isuzu engines. It ensures a tight seal for the thermostat, aiding in proper engine regulation.