Hinged covers made of ductile cast iron equipped with spring-loaded lid locking in the frame. Vertical and horizontal shock-absorption is provided by a PUR shock-absorbing lining on the lid resistant to oils, salts and de-icing agents.
The lid can be secured against theft by non-removable connection of the lid to the frame with a stainless steel pin. The safety of work when entering the shaft is ensured by the open locking of the lid at 90°.