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body GGG50 bonnet GGG50 PN16 ductile iron resilient seal socket gate valve Major parts material 1.Body:GGG50 2.Disc:GGG50+EPDM/NBR 3.Stem nut:Brass 4.Stem:2CR13 5.Gasket:EPDM 6.Bolt:carbon steel 7...