A manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

Manhole covers date back at least to the era of ancient Rome, which had sewer grates made from stone.

Weifang Shengao Machinery Co.,Ltd.

Supply sand casting manhole covers 

Supply metal mold casting coated with resion sand manhole covers