What brand/model is this skimmer?

[Reef Pilot]

This skimmer has Beckett venturis, which is why I thought it was an MRC.

The part that I'm having trouble with is inside the box at the base of the main riser. There is an internal acrylic cylinder chamber with a ring that is placed around the outside to create a swirl for the bubbles as they go up to the main riser. This internal cylinder has 2 holes for the pipes coming from the injector tubes in the body.

But I can't figure out how you get these pipes fitted into this internal chamber. Right now, I have them to the side, so the water is not really flowing into that chamber. It still works, and I can't get a lot of skimate in the collector, but it is obviously not set up right.