The Syr Drufi + FR is a compact armature specially developed for the house entrance installation according to DIN 1988 consisting of a semi-automatic backwash filter according to DIN EN 13443- 2000 . The Drufi + FR combines modern technology with modern design and high-quality workmanship. Connected to a drain pipe DN 50, the integrated funnel directs the backwash water into the sewage system. The Drufi flange range is used for installation in the pipeline. The flanges can be installed in vertical and horizontal lines.