Connection unit for installation in device inserts in the underfloor area for individual modules in keystone design, suitable for underfloor device inserts from OBO Bettermann (Ackermann), some types from Electraplan Solutions, design GB2, including module carrier for keystone modules, cover caps and blank covers, plug-in direction of the modules inclined 45° upwards, with viewing window for enclosed label insert, label sheet 209 x 294 mm see accessories, integrated dust protection flaps (also available in color), color: device cup black, cover parts pearl white, variants: 3 port, 6 port, 9 port