TubeNet

Yo,
Haven't seen one. I've always wanted to try more of them out. I've heard from some that they really make the PT instruments play great and the recent discussion about the PT receivers has made me think about it lately. Although the ones I have tried, I haven't been a big fan, but who knows, season change, hair styles change, interest rates fluctuate.
Bill

Here's a link to the Perantucci mouthpiece catalog pages (.pdf), and list of size relationships among them:

http://www.hornboerse.de/englisch/mouthpieces.htm

And a cross reference chart, with other makes as well as PT:
http://www.ibowtie.com/tubampccharts.html