sand casting manhole cover and frame ISO9001:2008 Material:ductile iron,gray iron ... :sand casting OEM foundry casting sand casting round manhole cover and frame1.Material:grey ironGG15,GG20,GG25,GG30,ductile ... on Time.3, Shipping: As per Client request, We can accept CIF, FOB,DDU etc. Or Client Authorized Agent, we supply all the ... foundry and a machining shop. sand casting round manhole cover and frame