... ,etc 2,Model:DN80,DN100,DN125,DN150,DN175 3.Type:ZX flange,SK flang Weld-on collarsInner diameter: 2", 2 1/2 ... ", 3", 4", 5", 6"Outer diameter: 3.06", 3.45", 4.18 ... .1 Carton boxNo.2 Iron box, Wooden box No.3 Seaworthy packing, according to the customer demand. Concrete pipe flanges , Weld-on collars