High Quality: The thermostat head is made of plastic, alloy, which is not easily deformed or damaged. Convenient to use and durable. Upper limit of zeroing ratio: 0, *, 1-5. 5 levels of modulation, easy to install. If you want to close the valve, screw it in until the arrow points to 0. Thermostatic valves suitable for valves with M30 x 1.5 threaded connections and M30 x 1.5 threaded connections from radiator manufacturers. Frost protection: Thermostatic valves with antifreeze and regulation function. The integrated frost protection allows the use of this thermostatic head even in cold areas and prevents the radiator from freezing. No fixed temperature setting range: this thermostatic radiator valve, which is influenced by the temperature temperature and room temperature, is able to detect changes in outside temperature. Advantage: High-definition internal structure design, the control button is marked with a scale, which can control the internal temperature according to of your needs. Widely used thermostatic valve for water, non-corrosive liquids and non-flammable gases.