Device for rendering the unauthorised removal of covers/gratings on water supply and sewage system installations more difficult via expanding rubber components

摘要

A device for rendering it more difficult to remove a cover and grating belonging to water supply and sewage systems. A rubber component (3) is placed on at least one of the grating's/cover's sides, inside the surrounding frame. The rubber component is made to expand via the insertion of a metal object (4) into the said component.IMAGE