Premium MaterialOur radiator control knob is made of high-quality plastic and alloy, ensuring durability, excellent performance, and resistance to deformation or damage. It is easy to install and has a long service life. 5 Modulation LevelsThis radiator valve thermostatic offers five user-friendly modulation levels: , 1, 2, 3, 4, 5. It can be easily adjusted and offers a frost protection function. To turn off the thermostat, simply set the modulation index arrow to 0. Automatic Temperature AdjustmentOurtrv radiator valves can automatically sense temperature changes in the room and adjust the temperature accordingly. If the room temperature deviates from the set temperature, the valve will automatically regulate it. Wide ApplicationsDesigned with M30 x 1.5 threaded connections, our thermostatic radiator valve head are compatible with radiator manufacturers using 30 x 1.5 threaded connections. They are commonly used in heating piping systems, water pipes, and for home and office decoration. Product Name: trv radiator valves Material: Brass, alloy, and plastic Threaded Connection: M30 x 1.5 Spool Size: 15mm Color: White