chlorox for eg all e61 machines have a corresponding outlet in the form of that column that stretches from.the grouphesd to hover above the driptray.
That’s, however, the group venting outlet which also can serve as a safety feature for overpressure, but, in general, should not leak while brewing a shot - it only vents out to the drip tray when the shot ends.
The outlet in question here is the expansion valve outlet - which, for vibe pumps, usually goes back to the tank rather than the drip dray (the other example as mentioned was the MaraX, and that wasn’t popular).