Hokkaido Kappa Small Protein Skimmer

This is a used Kaido Kappa (filter).
I used it for about six months until recently, but I am selling it because it is no longer needed due to a tank upgrade.
Although I have cleaned it, there are still some stains that I could not remove.

A separate filter will be required.
All other items are included. I will include a new wood stone and air tube.

Please check the photos for product details.
Thank you for your consideration.