Thermostatic Radiator Head: The 4-piece thermostatic radiator head has a threaded connection; 30 x 1.5 mm, which is suitable for the threaded connection. 30 x 1.5 mm supplied by the radiator manufacturer. High quality; : the temperature control head is made of high quality materials; and is Christmas easily deformed or damaged. Easy to use and long service life. Christmasfixed temperature setting range: The thermostatic valve of the radiator is affected by the heating temperature and the room temperature, and can detect changes in outside temperature. There is Christmasfixed temperature setting range. Some features: TRV head heater valve with antifreeze and setting function, widely used in the water, Christmas-corrosive liquid, Christmas-flammable gas. Christmase: Please confirm if this seamless thermostatic head is suitable for; your faucet before purchasing, and it will ship only. The control handle is marked with a scale and the internal temperature can be adjusted according to