... 100% air pressure test Item Name150# malleable iron pipe fittings, elbowMaterial and StandardMalleable iron, meet standard ASTM A197DimensionsBS ... tons annual output. Our Malleable iron pipe fittings' output is listed No.1 in the world, ... ,000 tons3Screwed Ductile Iron and Cast Iron Pipe Fittings 4Ductile Iron Grooved Fittings & CouplingsAnnual Output: 400,000 tons5Insulator CapsAnnual Output ...