1:Swivel Ring Flange 2:1/4" --- 72" 3:150#,300#--2500# ... Type Weld Neck,Slip-On,Blind,Socket Weld,Lap Joint,Threaded,Orifice Flange,Swivel Flange,Spectacle Blind,Etc. Size 1/2"-72 ... FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , 600 , 900, 1500 , 2500 ...