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Steve, there are many other considerations which dictate the post in addition to what Sallot has pointed out. Start with the backup reg - it needs to be on the left post. Proper regs ( downtream, openable underwater, scooter without taking on water, pass without filling full of water, operate without presure relief hoses, can be equippd with any hose length) feed right to left. To put that reg on the other post would be a mess of sticking out hoses, but there is more. Clearly you want one reg on each post ( redundency, why you have a dual port manifold). As Sallot said, you have a third reg if you run the inflator from the right post ( in case you discover your backup has shut down ). We put that inflator on the right so as to give us two backups, and so as to not dicover a turned off valve by loss of inflation at a critical juncture, as well as to have as many hoses as possible pasing behind the head to hopefully hear any leaks that may occur - gas moving through a hose, especially helium, is quite audible at depth. Loss of pressure guage is easily discovered on the second look - presure has stayed the same. Spliting up the dependency on the regs is a good practice . The right post allows the FULL length of the seven foot hose to be used and deployed. The length is necessary to compfortably run down behind the wing, under the light ( if you are wearing a light, or under the knife on the belt, or just around ) back up the left side out of the way of everything , behind the head and into the mouth feeding again right to left, or clipped off on the right chest d-ring when staging. Shorten that and you have a bad feed. Nine feet is to long and is unmanageable. The correct body position for diving and decompressing is always supine, not vertical. To be vertical is an invitation to DCS, and is just sloppy practice. The hose floats up against the body. When you do get vertical, it is held down by the wings, the light, and or the knife, or you can stick it in the belt if you have some need to be vertical and the hose is annoying you. If you do have to share gas, and you have the hose on the wrong ( left post), it is going to be crossing your head when the donee is in front, and then it is going to be kinked and possibly therby shut off when trying to arrange it either in front or behind you, and then you get the real panic . Hose coming from that post is not long enough for a good air share under way, and unless placed on top of everything else can not be cleared to donate - this may cost you dearly. Steve, a good system like DIR is designed to allow you to add anything to the dive without changing anything that is there to start wtih. I know, I do some crazy stuff, and what I go long with is exactly what I take on a wreck bounce dive, only more of it. The basic rig remains unchanged, and that is what makes it so good - eveyone always knows what to expect and how to operate it. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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