OTTO Excavator Spare Parts Uc-25 6Sa1 Thermostat Seat 1137161290 113716-1290 1-13716129-0 For Isuzu This OTTO Excavator Spare Part, the Uc-25 6Sa1 Thermostat Seat with part number 1137161290, is designed for Isuzu engines to regulate and maintain optimal operating temperatures.