Question What (if any) brands of BC integrated 2nd stages is this QD post found on?

[DiveGearExpress]

Let's see if we can "crowd source" an answer to the following question:
In the picture below, if "S" is ScubaPro Air II, et.al. and "A" is Aqualung AirSource, et.al. then what is the "?" post found on?
Please no guessing, if you aren't reasonably sure, please don't guess. The threaded base on all three is 3/8"-24 UNF.
Can you contribute a picture of a 2nd stage (or other device) with this post?

 

[scubadada]

How about the new DGX Gears BCI, XS Scuba Multimax, and Mares Air Control?

 

[greeniguana]

 

[scubadada]

View attachment 776963

I do believe you got it

 

[-JD-]

Note Broken into 3 posts due to forum limitations ...

Caveats:

• Not the best picture - inconsistent angles and scale.
• I am not an expert, but never the less, I'm not letting THAT stop me

I'm not sure that your "S" and "A" are correct to start.

The left fitting does not seem to have the expected locking-ring double-chamfers that I have seen in the ScubaPro style fittings but it does seem to have the same barrel OD before and after the lock ring like the SPs

Reference links & pics:
Crusty Air2: Scubapro 4th Gen Air 2 Alternate Air Source BC BCD Octo Inflator Scuba Dive Air2 | eBay

XS Scuba ScubPro Adapter: XS Scuba “ScubaPro Style” QD Adapter — XS Scuba - Everything For The Perfect Dive

 

[-JD-]

The middle fitting looks like a CEJN or Omniswivel high-flow connector.

Reference links & pics:

XS Scuba CEJN Adapter: XS Scuba “CEJN Style” Drysuit QD Adapter — XS Scuba - Everything For The Perfect Dive

Lombardi Undersea 3/8" Male UNF to CEJN Nipple: CEJN-style male nipple to 3/8-24 UNF male

ETA: Omniswivel pic here - embedding not supported: Quick Disconnect Male: 3/8

 

[-JD-]

Finally the last (right) looks most like a foreshortened image of an Aqualung with the larger barrel OD at the end and a smaller OD past the locking ring:

Reference links & pics:

XS Scuba AquaLung/Seaquest Adapter: https://www.xsscuba.com/hose-adapters/aqualung-seaquest-style-qd-adapter

Crusty EBay Airsource listing (not great pics): Air Source Scuba | eBay

Better images from an EBay Seaquest-branded version: SeaQuest Alternate Air Source BC BCD Octo Inflator Scuba Dive Air 2 II Aqua Lung | eBay