OTTO Excavator Parts Tfr55 4Jb1T Thermostat Hose 8973541550 897354-1550 8-97354155-0 For Isuzu This product is a thermostat hose designed for the Tfr55 4Jb1T model of Isuzu engines for OTTO excavator parts. It serves to help regulate and control the engine's operating temperature.