The Atlantis has an o-ring on the drip tip. I took it off last week when i cleaned the tank etc; however, I wasnt exactly sure about the proper orientation of the ring.
See, at has an inner-ridge, that I assume fits into 1 of the 2 ridges that are machined into the drip tip.
Which ridge does the o-ring "lip" fit into for proper orientation?.. the top or bottom ridge of the drip tip?