Funny you picked up on the water level sight tube its probably the only hose I haven’t replaced just sprayed some tfr in it and came up like new. Lost of new parts on it from the waste valve to gauges, lights, heat exchanger all hoses, knuckle valve, modified the exhaust outlet, better sound defining around blower silencer & exchanger new solenoid valves, engine is only 2 years old, blower in mint condition. Like a new machine now, very happy with result and a fair bit quieter running.