Material: 20# steel (Alloy steel,twin wall aslo can produce) Weight: 17kg (6mm with SK flange) Processing way : Hot expanding Size: 5"-4"*918mm (other size aslo can produce) Flange type : SK ( HD,ZX,MF can do) Referece lifetime: 20,000-4,000CBM. Connection type : clamp Cleaning way : use cleaning ball