Quote Originally Posted by Photo Engineer View Post
It goes on the bottom of the drum with the ring inside the lip of the drum. I have to look it up in the catalog as to name and exact function, but a new drum comes with the ring attached that way. I removed them immediately and have never used them.

PE
Thanks.

I tried inserting it in the tank mouth, which doesn't fit. I didn't think of the bottom. I'm trying to imagine the function, but failing. But it sounds like I will be fine sticking it in a box somewhere and not worrying.