Birum Br 631 Cartridge Filter, Express Lavamagic, Firstline 4100.9.

Inner diameter: 155 mm Outside diameter: 188 mm Height: 165 mm with Anse. Replaces once a year in normal use. Fits: Birum: BR 631, BR 632, BR 633, BR 634 N, BR 635, BR 635 N, BR 636, BR 646 E - Express: Lavamagic, Re 20, Top 20, Vetrella - Fadi Professional: 20L, 30L, 50L, 60L, 90L - Firstline: 4100.9, 4103.9, 4105.9 Version Lock, 4109.9, FCV13 D-8 - SIDEME: Green Air 20L, Clean 30 L, Lavaspira, SU 9600, SU 9850 - SIDEX: Green Air 20L, Clean 30L, Lavaspira, SU 9600, SU 9850.