With labeling field. For the installation of central plates from the Busch-Duro 2000 SI and Reflex SI series, e.g. sockets, potential equalization, antenna, and ISDN sockets, etc. Delivery does not include central plate. Comes with sealing ring and 2 keys. IP44 only in combination with Allwetter 44 frame. Compatible with central plates 1746-...-101, 1743-04-..., 1743/10-04-... or data inserts with cover plates 50 x 50 mm, e.g. from Ackermann, Rutenbeck, BTR, Telegärtner. Compatible only with covers featuring recessed installation devices. Allwetter 44 (IP44): 66.7 x 10 mm.