OTTO Excavator Spare Parts Nkr77 4Jh1T Thermostat Seat 8973729890 897372-9890 8-97372989-0 For Isuzu This product is a thermostat seat designed for the Nkr77 4Jh1T model, used in Isuzu engines for OTTO excavator spare parts. It helps regulate the engine's operating temperature effectively.