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On Fri, 29 Jul 1994, David Doolette wrote: > Could anyone who uses the SCUBAPRO D-400 second stage or the previous model > (whatever that was) give me any opinions on it. I use a SP D-350 (predecessor to the D-400) as my backup nitrox regulator on mixed-gas dives. However, I originally used it as my backup trimix regulator, and I continue to use it occasionally as my backup regulator on deep air dives (most recently, about 2 hours ago). From my experience, it breathes easier than the G-250, both on inhale & exhale, at all depths I've tried it (down to 400+fsw). I like it MUCH better than my Odins (quite frankly, I don't know what all the hype about Odins is....sure they have a larger ID hose & all, but in the real world I've found them to be adequate below 150', MISERABLE at decompression depths, and the most temperamental regulators I've ever owned). The D-350 does seem a little finicky if ignored in a closet for too long, but generally I've found it to be reliable. I know Jim Bowden was using a D-400 on his deep cave dives with Sheck in Mexico. When I spoke with him last (January this year), he seemed extremely satisfied with it, and told me it worked fine for him down to 700 or 800 feet. I don't know whether or not Sheck was also using one, or if they were using them at the time of the accident. > In particular, as a cave > diver, I am interested in how they perform when diving in a head down > attitude and how breathing resistance changes from moving from head up to > head down. Do you need to tune them down for head down diving? I would also > like to know how easy they are to keep in tune (cost of parts, how often > they need servicing). I'm not a cave diver, and I've never noticed any difference in performance depending on relative position - I'll pay more attention next time I use my D-350 (next week). There's not a whole lot to adjust inside - VERY different mechanism from the balanced adjustable series. It has a Dive/Predive switch which seems to reduce free-flow problems. Parts cost about the same. Hope that helps.... Aloha, Rich deepreef@bi*.bi*.ha*.or*
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