Reflex membrane pressure expansion vessel 7209400 Reflex N 50, white, 6 bar Reflex membrane pressure expansion vessel Reflex N 50, white, 6 bar, membrane pressure expansion vessel for closed heating and cooling water systems, built according to DIN 4807, approval in accordance with EU Pressure Equipment Directive 97/23/EC. Foot construction for fastening from N 35 - coated on the outside - membrane not replaceable.