Installation box for concrete installation has functional part with tightening ribs that engage under domes when part turned in one direction, ejection ribs that move it to withdrawal position

摘要

The box has a fitting space for electrical devices and an essentially cylindrical functional part (8) for insertion into an opening with a flange (9) that sits on domes (5). The functional part has tightening ribs (10) that engage under the domes when the part is turned in one direction and ejection ribs (13) that move the part into a withdrawal position if tuned in the other direction.