manhole cover, casting manhole cover 1.sand casting 2.different sizes or as per customers' requests 3.ISO9001:2000 manhole cover, casting manhole cover, ductile iron manhole cover, grey iron manhole cover, cast iron manhole cover specifications: over frameweight material Loading capacity 300*3006.7 ductile iron B125 350*3508 ductile iron 400*400 10 ductile iron 500*500 19 ductile iron 600*600 26. ...