Reflex expansion vessel REFIX DD green, 10 bar, 18 l: for drinking water, pressure boosting, and water heating systems according to DIN 1988. Connection made of stainless steel, featuring a high-flow flow-through star. Membrane according to DIN EN 13831/DIN 4807 T5/KTW-C and W 270, constructed and tested according to DIN 4807 T5. DIN DVGW Reg. No. NW-0411AT2534. Approval according to the Pressure Equipment Directive 97/23/EC. Coated inside and out according to KTW-A. Pre-charge pressure 4 bar, compatible with Flowjet flow control device, up to 70 °C. Additional technical specifications: Flange pressure rating: other, suitable for cooling: Yes, suitable for drinking water: Yes, suitable for central heating: Yes, medium temperature (continuous operation): -10.00 degrees Celsius, with replaceable membrane: No, with mounting material: No, with feet: No, with pressure gauge: No, with safety valve: No, nominal diameter of expansion connection: 3/4 inch (20), horizontal placement: No, vertical placement: Yes, outer pipe diameter of expansion connection: 26.90 mm, material of membrane/bellow: Butyl rubber IIR, max. operating pressure: 10.00 bar, max. glycol mixture: 0.00%.