Concrete Pump Flange 1.Schwing,Putzmeister,Sany,Kyokuto,etc 2,Model: ... /2", 3", 4", 5", 6"Outer diameter: 3.06", 3.45", 4.18", 5.18", 6.18", 7.20", 8.20 ... box No.3 Seaworthy packing, according to the customer demand. Concrete pipe flanges , Weld-on collars