Ductile iron manhole cover is made from spheroidal graphite cast iron by machining hand moulding, solid top, recessed,double triangular, single seal or double seal, square or rectangular or round,with or without hinge. Very good quality, smooth and free from sand holes, blow holes, distortion or any other defects. Loading capacity is 40 tons. The normal coating is black bitumen 30 microns thickness, also can make the epoxy coating according to the customer’s demand.