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My Dive Rite manifolds have those "dip" tubes (as I've heard dive shop workers call them). If yours doesn't, then maybe you were shorted them by mistake. As for what they do, if the tank is oriented upside down (not that unusual during a dive) then any loose debris that might be in the tank would likely not get into the valve and your windpipe. Egil Aabel Naesguthe wrote: > > Every one agrees that the Dive Rite, Scuba Pro and Sea Elite (I have not > seen these myself) valves are equivalent, but why do only the Scuba Pro > valves have the thin tube sticking down inside the tank below the threads? > What is it supposed to do? The only explanation I have heard some time > ago was that this would guard against sucking in any accumulated CO2, and > possibly against any loose debris inside the tank, but I don't know about > that. It can't be that critical if Dive Rite omits these tubes. > > Egil. -- Dave Mabry dmabry@mi*.co* Great Lakes Maritime Institute Underwater Research Team NACD NSS-CDS #42872 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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