Ductile Iron Manhole Cover and Frame With Safety System

A new anti-noise and anti vibration Elastomer PP(polyethylene-polypropylene) for lid support.
The joint is attached to the edge of the frame. Housing for understanding and allows a seal automatic manhole cover.
Reliability of the bolting in the closing: the manhole cover is locked with accessories with two anti-theft locks devices.
Double anti-instrusion lock with special key: allows to open the manhole cover only a person is authorized.