... ,C250,D400 Custom Manhole Cover1. Product informationManhole Covers are manufactured for construction and public use. Manhole Covers shall be smooth and ... . EN124 A15, B125, C250, D400, E600 and F900 b. A60005 for casting design c. Major standards designs available d. As per ... , drainage pipeline well; heat supplied, gas well;(4) As cover board for anti-corrosion project, open ditch; it as well as can ...