Chihiros Clean Hose are the special water pipes for Chihiros Jet Inflow and Outflow, and they can also be used in other canister filters. They are really professional water pipes, and the quality of them is better than that of original water pipes of common canister filters, more transparent, firm and durable, environment friendly, no smell, uneasy to harden and knot, moderate hardness. Jet Pipe Diameter 13mm