OTTO Excavator Spare Parts Zx120 4Bg1 Thermostat Seat 1137118040 113711-8040 1-13711804-0 For Isuzu This OTTO Excavator Spare Part, the Zx120 4Bg1 Thermostat Seat with part number 1137118040, is designed for Isuzu engines to regulate and maintain the optimal operating temperature efficiently.