Simate Engine Coolant Hose Preheater with Built-in Water Pump 110v 1000w High quality Simate Engine Coolant Hose Heater with Built-in Water Pump 110v 1000w Aluminum housing, ceramic thermostat (silver alloy contacts), Built-in water pump The device works like a water heater, the cooling water is circulated and heated at the same time, the built-in thermostatic control regulates the device automatically. Suitable for cooling water hoses 16-22 mm ( 0.63 in - 0.87in) internal diameter, Just between the coolant supply and return line of the indoor heat exchanger integrated -Fertig! Items in the package include: One set SIMATE heater, 2 X pipe clamps, instruction manual.