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Do not under any circumstances use the "pipe with two yoke fittings". These are for transfilling cyinders and should not be used underwater. Any hard knock will move the "pipe" out of alignment and blow an o ring, whoosh, no air. As you already have a pony, you must have a seperate regulator for it. Get a set of twin bands and another submersable pressure guage. Have two regs, one on each cylinder each with one second stage and on SPG. Preferably one reg should have a five to seven foot hose on it if you buddy dive. With this system you will have total redundency. If one reg blows up, just abort the dive. You must leave the bottom with enough air in EACH cylinder to reach the surface, and complete all required deco. It is also the cheapest system as you have almost everything you need. The twin bands you would have had to buy anyway whichever manifold you chose. You can hire cylinders and swap them over reasonably quickly, with a bit of practice. You may need to look at your BC volume though. You must weight yourself to be neutraly bouyant at your shallowest stop with EMPTY cylinders. 160 cuft of air wieghs a fair bit (I don't have exact figures at hand, sorry) so your all up weight will vary a lot from full to empty. If you are correct near the surface with empty cylinders, you may find your bc will not make you neutral when deep with full cyinders. A larger bc such as dive rite wings or zegal double wings may be required. Hope this helps, and let me know how you get on, Jason gasdive@sy*.di*.oz*.au* :-)
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