5-Step Temperature Control: The thermostat has 5 adjustable steps, allowing you to adjust the temperature according to your needs. 0 is off, intensity 1-5 in ascending order. When you need to vent for a long time and go out, you can adjust the lowest speed. </p> High-Quality Materials: The thermostatic valve body is made of high-quality forged and machined brass with nickel-plated exterior and plastic. Fine workmanship, excellent adjustment properties, very durable and long service life. </p> Constant Temperature and Adjustable: The thermostat has no fixed temperature setting and is equipped with a level and zero level probe to detect changes in the outside temperature, with antifreeze and temperature regulation functions. </p> Easy to Use: To assemble, align the ladder with "5", then screw on the coupling nut and tighten it. When installing, please note that the water flow arrow points in the same direction as the water flow. Vertical and horizontal installation is recommended. </p> Package Content: Includes 4 thermostat heads, radiator thermostat head for M30 x 1.5 mm threaded connection. Please check that this thermostatic head is suitable for your valve before purchasing. </p>