China Socket Fittings DI Socket Fittings with K-type Joint Coating: InternalPortland cement mortar lining Sulphate Resistant cement mortar lining High-Aluminum cement mortar lining Fusion bonded epoxy coating Liquid epoxy painting Black bitumen painting ExternalZinc(130g/銕?+bitumen(70microns) painting Fusion bonded epoxy coating Zinc-aluminum alloy (400g/銕?+liquid epoxy painting according to customers' requirements AccessoriesRubber ring (SBR, NBR, EPDM), "T" bolts and nuts, glandsChina Socket Fittings website:http://www.tianyisunspipeline.com/ductile-iron-pipe-fitting/socket-fittings/