Reflex membrane pressure expansion vessel 7307800 refix DD 12, white, 10 bar refix DD, flow-through membrane pressure expansion vessel for drinking water heating, water supply and pressure boosting systems. Built and tested according to DIN 4807 Part 5 or DIN-DVGW (Reg. No. NW 9481AT2534). Approval according to EU Pressure Equipment Directive 97/23/EC. Water flow using high-flow flow star and enclosed T-piece Rp 3/4, water-carrying parts protected from corrosion, membrane according to KTW-C, W 270, external/internal coating, internal according to KTW-A.