OTTO Excavator Parts Zx330-3 6Hk1T Thermostat Tube Socket 1137105890 113710-5890 1-13710589-0 For Isuzu This OTTO excavator part (Zx330-3 6Hk1T) is a thermostat tube socket (PN: 1137105890/113710-5890/1-13710589-0) designed for Isuzu engines. It ensures secure connection and proper coolant flow in compatible excavators.