fndmylove:http://www.scubatoys.com/store/Scuba_Alt_Air.asp
directly from scuba toys website, and scroll down to read the following:
H2Odyssey Extra Air System
This is the brand new one that comes with an on off switch!
A new twist on pony bottles, and spare air is the H2O Odyssey Extra Air System. The heart of the system is a unique regulator, that is threaded to screw directly into any standard thread scuba tank... choose from a 6, 13, or 19 cubic foot
We also have The Envoy RaZor first stage! It also is threaded to screw directly into any standard thread pony tank...
If you decide to go with either one just give me a call and we will get it heading your way!
Thanks
Joe