Hydrotwin II

[scubadiverbob]

Got all the parts (hopefully) to get it ready to dive. Had new gaskets made for it. Got a second stage I fixed up for an octo for it last night (Sherwood 4000). Got a parts list; but, no service manual. Question: Does anyone know the IP setting? Many regs are 135 psi ...

If anyone knows let me know ... I got to go do laundry and get Andrews HP steel tank filled .... Only one place to fill it that can do a fill to 3440 psi ....

DAV meeting is tomorrow (I'm the adjutant and haven't begun to type the minutes ....) so, another busy day for me!

Checking this out: www.ebay.com/itm/US-Divers-Aqua-Lung-DA-Aqua-Master-Vintage-Scuba-Diving-Double-Hose-Regulator-/261521664584?_trksid=p2054897.l5662 Blue label, Pico Blvd., non--chrome cans ... was thinking, I'll (hopefully) be needing a new project soon ... I still have a Calypso J to overhaul (it's cool, if I rent a tank without a J valve, I'll still have a reserve .... does it sound like I sometimes don't keep an eye on my spg ? )

[scubadiverbob]

www.ebay.com/itm/Nimrod-Snark-III-3-Stage-Vintage-Scuba-Diving-Double-Hose-Regulator-/261521588528?pt=LH_DefaultDomain_0&hash=item3ce3e6c130 This one (Snark III) would make a cool project also ...

Checking out all this seller has ... many double hose regs ... and pretty nice prices. Oh, well better get off the computer ... got to get Andrews tank filled ...

[sitkadiver]

Once you get it together, I would recommend playing with the IP a bit. Since they're unbalanced, I'd suggest a nearly empty tank( < 500 psi). I have founbd that my Hydro Twins like a slightly higher IP. Around 150 or so. It seemed too high when I was first playing with the NED, but the second reg proved to like the same higher IP. Even my balanced Hydro Twin II is set at around 145 or so.... I wonder if it's becuase of the longer intermediate air passages..... But I do not know.

[scubadiverbob]

I'm thinking what I have is balanced. I will have to check it out. There are/were two different HP seats used and I think the one mine uses is for the balanced one ...

[scubadiverbob]

The seat in mine looks like the photo I posted here: vintagescuba.proboards.com/thread/3409/buy-hp-seat?page=1#scrollTo=26093 and what I understand, the unbalanced regs use a different one that is the same as Healthways regs use. My reg doesn't have a lebel; so, I'm still uncertain ...

[nikeajax]

So, did you fix the plunger, I hope? I believe you're right about the plunger styles. Here's a link to a thread Dave started a while ago, and a swear they talk about the balanced regs...

vintagescuba.proboards.com/thread/3077/sportsways-hydro-twin

Jaybird

[SeaRat]

Robert, I'm pretty sure yours is a balanced first stage too. My Hydro-Twin is also balanced.

John

[scubadiverbob]

Mine is balanced .... sorta was hoping it wasn't. The Hydrotwin is unbalanced; Hydrotwin II balanced. I've been told the unbalanced Hydrotwin was only manufactured for a couple of years and are more rare than the Hydrotwin II's ...