... 90 degree cast iron elbows 1.Material:cast iron. 2.16 Years OEM & ODM. 3.UL FM certificate available. 90 degree cast iron elbowsFEATURESHousing Material:Ductile Iron material confirm ... , material and physical property meet ASTM A449 and ASTM A183. Model: Coupling, Elbow, T-joint, Flange. Usage1) Automatic sprinkler system ... on subway station,airport,seaport,bridge,ect. 90 degree cast iron elbows