Heavy Duty Cast Iron Manhole Cover and Frame Factory | YONGQIAN

A new anti-noise and anti-vibration PP (polyethylene–polypropylene) elastomer for lid support, with the joint attached to the edge of the frame and housing designed to enable an automatic seal for manhole cover operation. The cover is secured through reliable bolting and locked with accessories using two anti-theft lock devices, with a double anti-intrusion lock and special key that allows opening only by authorized personnel.