These 15mm thermostatic radiator valves are typically used to regulate the flow of fluid to the central heating system radiator. They are equipped with adjustment elements that control the opening of the valve to keep the ambient temperature of the room in which they are installed constant at the set point. 5 temperature settings, including frost protection. The number on the valve corresponds to the specific air temperature. After selecting the number, the thermostatic valve will maintain this temperature. This prevents unnecessary temperature rises and saves a lot of energy. It has a thermostatic head and a bidirectional two-way valve body. Built-in sensor with liquid filled components. Can be installed horizontally or vertically. Water pipe connection diameter: 15 mm Water pipe connection caliber: 20 mm Working pressure: 1.6 bar Maximum temperature: 120 degrees Maximum flow: 360 / LT / H Normal flow: 170 / LT / H Maximum pressure loss: 600 Mbar Sensor type: liquid filling Polished: chrome finish colour:White Material:copper Package Contents: 4 x Thermostatic Radiator Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.