Nailed it! That's exactly what I had been referring to.
That's a snazzy looking tip. Do you know the dimensions of it?
I got a few of these some time ago from a guy on ebay (seller ID 3rdeyedriptips ) you can search his listings, good seller prices vary due to auction.
Friction Fit Custom Wide Bore Acrylic Drip Tip w Delrin Insert by 3RDEYEDRIPTIPS | eBay
I measured one of mine:
Tip outside: 14.72 mm
Tip height: 15.38 mm
Insert outside: 8.69 mm
Insert inside: 7.58 mm
Overall height: 20.40 mm
These have the widest bore I have seen on any drip tip, I really like the friction-fit without o rings, really maximizes size of openings. I'm a lung hit guy. I do not like metal tips at all. They also fit Kayfuns, Drippers, and are perfect on all my Lemos (all my other tanks and drippers are in storage now).
Billowpro by Synervape Friction Fit Delrin Drip Tip w 3XL Wide Bore | eBay
The BillowPro are the ones shown on my avatar, I like them a bunch too.
Hope this helps