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I recommend calling Dive Rite In Scuba as they are an Aqualung Military Dealer.
 
I recently acquired a Conshelf 14 1st and second stage with the serial number CPNR0723 on the 1st stage and the 2nd stage sn is S0573864 and has a black diaphragm.
Is this a military reg or something as the 1st stage serial number seems out of the ordinary. It has 4 3/8" lp ports and 1 HP port so I know it is a later 14 and the 2nd has adjustment port on the side, thats why I picked it up?
 
The military ones are badged "Conshelf 14". Does the second stage have the tuning side port? The diaphragms on my military ones are translucent with yellow exhaust valves.
 
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The military ones are badged Conshelf 14. Does the second stage have the tuning side port? The diaphragms on my military ones are translucent with yellow exhaust valves.
It has the tuning port and the yellow exhaust valve. A couple of the 14 2nd I just bought have the translucent diaphragms which is probably the military diaphragm. I was under the impression that the Conshelfs labeled XIV 2nd stages did not have the tuning port and the 14 does.
 
It has the tuning port and the yellow exhaust valve. A couple of the 14 2nd I just bought have the translucent diaphragms which is probably the military diaphragm. I was under the impression that the Conshelfs labeled XIV 2nd stages did not have the tuning port and the 14 does.

That too is my understanding. 14 does, XIV does not.
 
https://www.shearwater.com/products/perdix-ai/

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