LA Spa filter cartridge. C45 with 85mm thread.
Length - 178mm:
Diameter - 133mm:
Hole threaded OD 85mm. Some filters have a Handle opp end others are flat like the photo.
These replace the older style Aqua Kleen bag filters.
There are different measurements for the LA 45/85 as they are a retro fit for the Filter socks but they all work the same.
Another common size is: Height- 200mm x Width- 127mm and same size spigot.