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I have one. It's a modern version with the port to make it easier to adjust the 2nd stage. Here's 1 picture of it.

A Hp seat is the seal between the High pressure air from the tank to the intermediate pressure going to the 2nd stage. When you breath on the reg, the intermediate pressure drops, and the piston pulls away from the HP seat releasing air from the tank to the reg. When you stop inhaling, the...

Great info on the aquarius. It was my 1st reg, but I sold it to buy a Calypso VI (which I still have). I bought an aquarius off of E-bay a few years back just so I could have one like my 1st reg.

Those diaphrams are hard to find. It took me a while, but I finally found one ( the USD black version). My gray diaphram was in pieces when I took mine apart. Unfortunately mine didn't come with the same style 1st stage, but the older style that came with the aquamatics. It also had a green...

That's also the 1st USD double hose I bought. Now all you need is a matching mistral without a serial number. Here's mine. I spent about a year looking on E-Bay to find one in good condition. But it's now 1 of my favorite double hoses. Sorry about the duct tape. Just a quick something to...

Don't believe the "No Prep" statements. Regs bang around on tanks & other gear all the time. If you don't do the prep work, I think you'll be disappointed in the long run. But the worst that would happen is that you'd have to re-do it down the road.

You can't just use any krylon paint. You need krylon for plastic. you should also look for a plastic primer (that's not exactly what it's called). This will help the paint bond to the plastic. Before you start, you should also lightly sand the plastic with 400 grit sandpaper, then clean with...

Ok, now I remember. I remember those from the Jacque Yves Cousteau specials. I never knew they were called the USD 1. But I'm not the collector I used to be. Too many hobbies, not enough $$$!

I've had it both ways. It pretty much will go either way. I never liked the ridge under my lip, so I reversed it. My 1st reg was an aquarius. I sold it to buy the conshelf. And you're right, they also came on the Calypso regs. But I've never seen the "yellow triple rebreather looking...

That, and it has a port so you can adjust the lever the same way as a 21. The old ones are kind of a pain to adjust without the service port. Here's a pic showing the port. You can still find the new XIV on E-Bay from time to time. I bought one a few years back that is supposed to be...

I think the vulcan knife is somewhat valuable. At the very least, it has the "Cool" factor.

I have one. Mine will hold air for about a day, but it has a slow leak. I bought mine about 1980 or 81. My buddy used to make fun of me in his horse collar, but I loved not having anything in front. I don't use mine anymore, so I don't know if it would hold up to diving. Here's mine.

I don't know the answer to this, but you might try sending a PM to Luis H on this forum, or posting this in the Vintage Equipment Diving Sub Forum.

Here's a good website showing nearly every scubapro regulator (if not all), along with a lot of history about Scubapro. Scubapro Regulator Museum

Does the chrome cover have to say balanced adjustable? If not, any 109 can be converted to the balanced version by a competent scuba tech (provided he has the parts). I had a 109 converted. It's no big deal.

I agree that you don't need to polish the seat unless there is a creep. I used 1600 or 2000 grit wet dry sandpaper when I did a calypso seat for one of the early diaphram models with no model number designation (from 65 or 66), and should not be confused with the Ops Calypso IV or My VI. I...

The big problem is the HP seat. I have a VI that I serviced about 2 years ago. I got the last HP seat from my LDS, and he didn't know where any more were. I can't think any anything else consumable that you couldn't find a replacement. You could try and polish the seat with very fine...

The water is 68 year round (that's not cold to me). The vis can be very good, but I've been there when there were check out divers, and the vis was less than 10 feet. At least till you got to the opening of the cave.

You are right, I hadn't had my coffee that morning I guess.

When I was looking for my 1st double hose, I didn't consider a Mistral because of all the factors you mentioned. After getting a DA without a serial number, I went looking for a matching Mistral with no serial number. After getting one & refurbishing it, I went on a few dives with it. It has...