I went to change the media in my Fluval 404, and upon putting it back together cannot stop it from leaking! The O ring looks OK to me, I tried to reinstall it wet and then with vaseline (per a recommendation) about ten times and still - the leak from the handle area persists! UGH!
My local pet shop said they'd see what kind of ORings they had in the back of the store for me to try (O brother), but as I said, my O ring looks fine (no nicks etc) and I don't feel that I'd be any better off with one of theirs. Any experience with this problem would be greatly appreciated!