Russ,
Welcome to Rebreatherworld.com
I am glad to see that you joined our community!
I bought a Manta-Bite Mouthpiece from you at the OWU Show in 2003, I then tried it out on my Ray Rebreather and it works great. I think I sent you once a few pics on a CD or by e-mail. (love the glow-in-the-dark)
If you search here on Rebreather World, the Manta-Bite has been talked about a few times.
Again, Welcome on board!
cheers,
RBN