The Syr Drufi + DFF is a fitting combination specially developed for home entrance installation according to DIN 1988 consisting of a candle filter according to DIN EN 13443 and a Pressure Reducing Valves according to DIN EN 1567. Because it is soundproof (group 2000 ), the Drufi + DFF is for installation in residential buildings according to DIN 4109 ( Sound insulation in building construction). With the Drufi DFF fitting combination, the correct installation order according to DIN 1988 is observed. The Drufi + DFF combines modern technology with modern design and high-quality workmanship. The Drufi flange range is used for installation in the pipeline. The flanges can be installed in vertical and horizontal lines. The built-in Pressure Reducing Valves enables an economy pressure setting.