The Cubex R 120/5 is an expansion tank designed for use in heating and water installations. It is made of durable steel and has a volume of 120 liters with a pressure of 5 bar. This type of expansion tank is used to handle volume changes in water that occur during heating, thus reducing the risk of pressure build-up in the system. The tank is compact and easy to install, and it is supplied with the necessary fittings and instructions.