The Reflex S 2/10 pressure expansion vessel is a diaphragm vessel designed for closed solar, heating, and cooling systems. It serves to compensate for changes in liquid volume due to temperature fluctuations, thereby stabilizing the pressure in the system. The vessel is manufactured according to DIN EN 13831 and meets the requirements of the Pressure Equipment Directive 2014/68/EU. The internal butyl diaphragm is non-replaceable and is also suitable for systems with antifreeze agents in the recommended concentration.