... Composite Manhole Cover productmodel(mm)colormaterialweight(kg)aplicationmanhole cover plastic400x400anycomposite4kgsfor motorized vehicles, municipal pipelines, communications, power, water supply, Green ... and other projects productmodel(mm)colormaterialweight(kg)aplicationmanhole cover plastic500x500anycomposite5kgsfor motorized vehicles, municipal pipelines, communications, power, water supply, ...