High quality: The thermostat head is made of plastic and alloy, which is not easily deformed or damaged. Convenient to use and durable. Upper limit of the zeroing ratio: 0, *, 1-5. 5 modulation levels, 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 of radiator manufacturers. Frost protection: Thermostatic valves with anti-freeze and regulation functions. The built-in frost protection allows this thermostatic head to be used even in cold areas and prevents the radiator from freezing. No fixed temperature setting range: This thermostatic radiator valve, which is influenced by the heating temperature and room temperature, is able to detect changes in the outside temperature. Advantage: High-definition internal structure design, the control knob is marked with a scale, which can control the internal temperature according to your needs.