First stage chart

[Prevailer]

Originally Posted by Blacthorn

The only other information which would be nice too would be the IP. At the least for comparison and the ability to mix and match 2nd stages.

GREAT idea, would love to see IP's included as well.

[pescador775]

Manufacturer-------Aqualung
Model-----------------Micra, etc with Cousteau/SEA 1st stg
Diaphragm/Piston------Diaphragm
Balanced/Unbalanced--Balanced
Swivel Turret----------No
Number 3/8" LP ports---3
Number 1/2" LP ports---1
Number 7/16" HP ports--2
Available in Yoke--------Yes
Available in DIN----------Yes
Enviro sealed------------Optional

[diven]

I am trying to decide on a new 1st stage and wondering what the difference is in the piston and diaphram models is. Which ones will freeflow or not.

[PentiumIV]

Manufacturer------- Scubapro
Model-----------------Mk19
Diaphragm/Piston------Diaphragm
Balanced/Unbalanced--Balanced
Swivel Turret----------Yes
Number 3/8" LP ports---5
Number 1/2" LP ports---0
Number 7/16" HP ports--2
Available in Yoke--------Yes
Available in DIN----------Yes
Enviro sealed------------Yes

[WD8CDH]

Originally Posted by skalkot

I think the majority of diaphragm regulators are environmenttally sealed. You may want to evaluate your chart.

I don't think that is true. Most are not enviro sealed but many can be converted or are available in an enviro version.

[WD8CDH]

Originally Posted by Creed

<snip>

The post 1998 Conshelf has 7/16" hp and lp ports, if I remember correctly.

Manufacturer: Aqualung
Model: Conshelf XI
Diaphragm/Piston: Diaphragm
Balanced/Unbalanced: Balanced
Swivel Turret: No
Number 3/8" LP ports: 2
Number 1/2" LP ports: 0
Number 3/8" HP ports: 1
Number 7/16" HP ports: 0
Available in Yoke: Yes
Available in DIN: No (not that I am aware of)
Enviro sealed: No (not that I am aware of)

Both use the still available XIV service kit.

The later Conshelfs have 1/2" or a mix of 1/2" and 3/8" LP ports and usually 7/16" HP ports.

So far, I have never seen any regulator with 1/2" HP ports or 7/16" LP ports.

I have seen that some regulators that used to be built with 1/2" LP ports have gone back to 3/8" LP ports.

I have never heard of any manufacturer go from 7/16" HP ports back to 3/8" HP ports.

[WD8CDH]

Manufacturer------- Poseidon
Model-----------------Cyclon 300
Diaphragm/Piston------Diaphragm
Balanced/Unbalanced--Un-Balanced?
Swivel Turret----------No
Number 1/8" BSPP LP ports---3
Number 1/8" BSPP ports--1
Available in Yoke--------Yes, comes with yoke adapter
Available in DIN----------Yes
Enviro sealed------------option

Note: these regulators use 1/8" British Standard Pipe Parallel threads (also called G 1/8") on the ports. They are similar in size to 1/8" NPT or 3/8"-24 but NOT interchangable.

[KaiSea]

I work for a company called Metaweb, where we are building Freebase: a collaboratively-edited database of cross-linked public domain data. I've created an area for Scuba Diving, where I've been I've been slowly migrating the info provided in this thread into a schema I developed for regulators (as I've been researching a new regulator purchase for myself).

The advantage of storing this info at Freebase is that, because it is stored in a structured format, you can ask for the data in a lot of different ways. Here are a few examples:

- All regulators in the database

- All Zeagle Regulators

- All environmentally sealed, balanced diaphragm first stages

- All 1st stages with five 3/8" low pressure ports

You can modify the view by clicking the "Add Columns" button and selecting the properties you wan included. Also note, if you click the "Use Results" button towards the top of the page, you can export all of these results into an Excel spreadsheet (and various other formats).

I'd love to create a centralized repository for all regulators, so if you have information about a particular model, it'd be great if you could contribute it. I've got a good deal of data on Zeagle and Scubapro regulators loaded, but there are still a ton of models and manufacturers missing. Obviously, the more data we can load, the more interesting the above (and other) views will be come. Also, if you have any suggestions on other useful properties to include (MSRP?, first manufactured data?), please let me know.

And just to be clear, this is public-domain data. The data stored in Freebase is all freely available via a Creative Commons license, so anyone and everyone is welcome to use the data how they see fit. There's also an API available to access the data for any programmer types.

Would love to hear your feedback!