BWT pressure reducers protect water supply systems in single and multi-family homes, commercial and industrial buildings from excessive supply pressure in accordance with ÖNORM EN 806-2 in conjunction with DIN 1988-200. They thus help to prevent pressure damage, reduce water consumption and ensure sound insulation. The pressure reducers serve to reduce the pressure and regulate a desired back pressure and keep it constant, even if the inlet pressure fluctuates greatly. An even and not too high pressure protects fittings and devices in the entire water supply system.