Flexible bush for separation of water or gas pipe or electrical conduit from house wall is suitable for use in holes of different diameter and has double cavity wall

摘要

A pipe passing through a hole in a house wall is separated from the wall by a flexible bush. The bush has a double cavity wall (60.1;60.2). The gap between the walls is maintained by a spacer ring (60.3) which has a weak point (60.5) which simplifies a folding action.