... ,CE,MSS,JIS,DIN 4)Certification:ISO,API GalvanisedGalvanised U Bolts sizeM3-M76Faceplain,zinc plated,black oxide,hot dip galv.etcMaterialCarbon ... static sealing element of pipe ,value.pump,thermal exchange,condensing tower,plain hole and man hole of flange ,etcSpecial design available ...