Wall duct for supply line i.e. gas line, in building, has internal and external sealants radially expandable by respective actuators, where actuators are accessible from inner side of inner wall, and tool penetrating into internal sealant

摘要

The duct (10) has a protective pipe (13) insertable into a wall opening (11) and carrying internal and external sealants (16, 17) at its exterior side. The sealants are radially expandable by respective actuators i.e. tightening screws (18, 19), and clamped against an inner wall (12) of the wall opening. The actuators are accessible from adjacent inner side of the wall. An actuating tool (S) penetrates into the sealant (16). A circular guiding device (20) is firmly connected with the protective pipe.