Use this to convert:
1) 12mmID/16mmOD connection to a 16mmID/22mmOD connection.
2) 16mmID/22mmOD connection to a 22mmID/28mmOD connection.
Material : Stainless Steel
Connection : 12/16mm to 16/22mm | 16mm/22mm to 22mm/28mm
Dimension : 48mm Length
1) Hailea HS-66a(16/22mm) in and out connect to Eheim2213(12/16mm) in and out- you will need two of this.
2) Eheim 2213(12/16mm) connect to VIV Lily Outflow(16/22mm) – you will need one of these.