Where Does The Rubber Ring Go On Fluval 403?

[Mauve]

hi, I got this Fluval 403 Filter on a garage sale. Inside, a loose rubber ring knocking around. After searching around interenet I figured, it is a seal of some kind, but it is unclear where to install it. The manufacturer's site is useless with their microscopic illustrations.
Does anyone know where to put that ring?
Thanks.

 

[Jen]

Is it a big ring, or a small ring? (dinner plate size, or golf ball?)

 

[Mauve]

Is it a big ring, or a small ring? (dinner plate size, or golf ball?)

It's the big one. I didn't know there are more than one...

 

[stegoodall]

it goes on the bottom of the pump bit. when its put together it is in betwqeen the 'bucket' and the 'top'.
hope this helps

 

[Mauve]

it goes on the bottom of the pump bit. when its put together it is in betwqeen the 'bucket' and the 'top'.
hope this helps

I did try to put it there but it keeps "rolling" off, and when I finally manage to hold it in place, the top ends up being too high from the bucket so that is would not close/lock.
Here is a photo: