Went out to a customers house to clean her very old Nautilus time bomb, I mean filter. 36 sq ft running on 7 filters. Somebody had taken duct tape and jammed it up into the port, then taken more and wrapped it around to seal of the hole as best as possible. I should have taken a picture but I forgot. Funny the things that people do. I have to tear into her spa filter which is identical, so we will see what we get into with that one.