Thermostatic Radiator Head: The 4-piece thermostatic radiator head has a 30 x 1.5 mm threaded connection, which is suitable for the 30 x 1.5 mm threaded connection provided by the radiator manufacturer. High Quality: The temperature control head is made of high-quality materials and is not easily deformed or damaged. Easy to use and long service life. No Fixed Temperature Setting Range: The thermostatic radiator valve is affected by the heating temperature and room temperature, and can sense changes in outdoor temperature. There is no fixed temperature setting range. Some Features: TRV head heater valve with antifreeze and adjustment function, widely used in water, non-corrosive liquid, non-flammable gas. Note: Please confirm whether this homogeneous thermostatic head is suitable for your faucet before purchasing, and it will only be shipped. The control handle is marked with a scale and the internal temperature can be adjusted according to your own needs. Product Description