... China(mainland) materail: cs and ss coating:rust proof oil,yellow,galvanized We can supply various standard and material flanges FLANGE:WELDING ... Remark:1)GOST 12820:PLATE FLANGEGOST 12821 :WELDING NECK FLANGE2)ANSI B 16.5 :WELDING NECK ,SLIP ON ,THREADED,LAP JOINT, ... SABS1123:SLIP ON ,WELDING NECK ,PLATE,BLIND We are a leading manufacturer in flanges and pipefittings in China and our products have ...