My "new" independent doubles setup

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Ha ha ha ha, I've copied your design AfterDark, but with extra whoosh, ha ha ha ha!!!!!!!!
For dinosaurs everywhere, The Moreairforus Regasaurus, I'm going to get a patent on it

The Moreairforus
full.jpg

Regasaurus

Ha ha ha ha ha ha ha ha ha ha ha ha ha!

I just have to remember that if it fails and that's coming from my history of no failures
breathing air underwater, in almost fifty years, to spit it out and just put another reg in

Brilliant job keeping our end up without asking permission as that's what real divers do


Ultra magnificent, the way we like it!
 
That's not what an IP gauge does. An IP gauge tests the tuned output of the first stage.

To test cracking pressure of a second stage what you want is a magnehelic.
Dual Pro Stand, 5-0-5 Magnehelic, IP Gauge, Four SpinOn Adapters

For work of breathing of the second stage you'll want an ANSTI test system
JFD | Ansti testing equipment[/QUOTE

I'm speaking of dynamic IP when we flow test the regulator with and without the switch to see if we also see a difference under the two conditions in dynamic ip.
 
I'm speaking of dynamic IP when we flow test the regulator with and without the switch in place to see if we also see a difference under the two conditions in dynamic ip.

I have a flow bench with a Venturi pump setup.

upload_2021-8-8_6-13-29.jpeg
 
I'm speaking of dynamic IP when we flow test the regulator with and without the switch in place to see if we also see a difference under the two conditions in dynamic ip.

I have a flow bench with a Venturi pump setup.

View attachment 675254
That's what I'm talking about! Nice setup! That's more than I can do which is why I asked about the IP gauge. I was pretty sure just a IP gauge wasn't going to prove very much which was why I asked.
I'm a waitin'.
 
Ha ha ha ha, I've copied your design AfterDark, but with extra whoosh, ha ha ha ha!!!!!!!!
For dinosaurs everywhere, The Moreairforus Regasaurus, I'm going to get a patent on it

The Moreairforus
View attachment 675238
Regasaurus

Ha ha ha ha ha ha ha ha ha ha ha ha ha!

I just have to remember that if it fails and that's coming from my history of no failures
breathing air underwater, in almost fifty years, to spit it out and just put another reg in

Brilliant job keeping our end up without asking permission as that's what real divers do


Ultra magnificent, the way we like it!

Nice but where are the dreaded inline shutoffs! It can't be a deathtrap without inline valves. Also are you sure you'll "just put another reg in your mouth" and not rush to the surface in a panic instead?!?! LOL! Great old neck strap too nice touch! Beautiful @happy-diver just beautiful! Imitation is the sincerest form of flattery. :wink: Or so I've heard.
 
I’m going to hijack my thread with a story from my youth about my 1st “dive” into customizing and modifying dive gear. The 9-year-old critter in the picture below is making his first double tank dive into the parlor rug armed against any bugs in the depths of the rug. The date was 12-25-1963 sometime late in day. My father made the double tanks of wood as a Christmas gift. Seven months later I bought my 1st snorkel, not a ball in a cage nickel and dime store snorkel but a real U.S. Divers AquaLung J snorkel!
vintage_diver circa 1960.jpg



During the summer I’d go to work with my father at his gas station and auto repair shop. Dad would put me to work and I’d find ways to be a general PITA, also Grandma’s house was next door and that was a great thing! It also exposed me to a lot of tools and material. My main job was to listen for the bell when the cars ran over the air hose that rang it as they pulled up to the pumps for gas. I’d run out greet them ask how much they wanted and then try to guess where the heck the filler cap was hidden. Behind the license plate, no behind the taillight on the fin in back! I’d pump the gas take the money, make the change and ask them to come back.
In between customers were the PITA moments if Dad didn’t keep me busy.

In the mind of the now 10-year-old tadpole if a 1-foot long snorkel is good a 3-foot long is gooder.
So a search began for a piece of hose that would slipover the snorkel. We all know how this ends.

I didn’t find one but there were rolls of brand new heater hoses of varies sizes in the shop surely one would fit! There was a roll with hose that was just right, after laying out 3 feet of hose on the bench I reached for the cutter and heard my father's voice “Hey that hose costs X per foot”. “How are you paying for that”? “By sweeping the office and shop later” I asked? “Ok go ahead was he reply”. Then he inquired WTH I was going to do with the hose? I told him and he replied “that’s not going to work”. To which of course I asked why not? My father wasn’t well educated but he had the golden gift of common sense, something at the time I lacked, really lacked. He stared off into the distance trying to form an answer then looked at me and asked, “why didn’t you buy a 3 foot long snorkel instead of that one”? Well, because I didn’t see one at the time was my answer. Dad said, “ That’s right you didn’t see one because they don’t make one because it doesn’t work”. That sound and undeniable logic didn’t slow me down one bit, I cut the hose and slipped it over the snorkel. Well, that hose looked like a limp…..the hose drooped down in an arc. No wonder it doesn’t work! All it needs is a stiffener. I got a yardstick and tried to tie onto the snorkel but it kept slipping. Notches it needs notches!
Again I hear my father just as I grab the knife, “what are doing”?! "I need that yardstick put it back"! “I told you that is not going work, stop wasting your time”! Foiled for now the wheels kept turning.

Later as I swept the shop I came across a prize under on of the benches, it was a solid square of 2” thick cork 3’X3’, with a hole in the middle, perfect! I asked my father what I should do with my new find and he said, "throw it out". OK Dad!

The next morning when I left for work with my father I had my mask and fins, if I could get the afternoon off I was going snorkeling! After we arrived and I did my opening chores. In between customers I worked at the hole in cork until it was the right size for the hose. Then I stuck a few inches of hose above the cork and used a old hose clamp to keep it there. Voila a floating snorkel!

I packed it all on my bike that had 3 baskets, 2 in back 1 up front plenty of room for my gear. It wasn't busy and my father didn't have any cars to work on so he let go a be crazy reminding me again it won't work and to be careful. I peddled my skinny a$$ a few miles down the road to the Tiverton town boat ramp on Stafford Pond where I snorkeled in the shallow water off to the sides of the ramp area. There was a 6’ deep channel for the boats. The area around the channel was 3-4 feet deep a familiar and perfect spot for the crazy young tadpole. After deploying the floating snorkel I took a few breaths on the surface then dove headfirst right into the laws of physics.

I spent the afternoon snorkeling around with my now unmodified snorkel, thinking about how my father knew this wouldn’t work.
 
I did the same thing with some type of garden hose snorkel mod. Lucky I didn't suck my lungs out. I vividly remember the air being squeezed out of me through that tube. Physics can be a bummer and has stifled many a creative kids imaginations.

Or second experiment with a garden hose surface supplied diving rig went much better. Double action inflatable boat pump, snorkel with a purge, and garden hose worked good to **** 10' after that it was too hard to pump.

Keep us up to date on your creation.
 
I never posted I had a problem switching regs I can do it my sleep. I posted that switches has a "drawback" in quotes. Why in quotes? Because I don't believe switches regs is really a drawback.

After 30 years of diving the same ID configuration I decided to try something different because, well I get bored and I have a lot of time on my hands and I can. So I last year around this time the idea came to me and I had one of the only type regulators ever made that could do it. So why not? The basic setup is sound, everything but the AIR is proven over many years of use so again I asked myself why not? I sent the AIR to be serviced because it had a slight free flow and the AIR looks to intimidating to me for DIY service. It looks to me the difference between servicing a 109/156 and an AIR is like the difference between servicing an abacus and a computer. I know my limitations.
More important than knowing what one can do, is knowing what one cannot do, that's what keeps ya alive.
I was perhaps nitpicking a minor section of your post, but not disagreeing with the larger body.

I was just disagreeing with this hypothetical-person, who hypothetically recommends against regulator switching at 100ft. Since we don't have this person in the thread, it's somewhat like arguing against a strawman.

The only time I might suggest a person doesn't switch regulators would be if they're inexperienced or unpracticed at it. For a person like that, it might be worth starting your practice in a safe environment, such as in standing-height water. For any person who may be reading this, and wants advice:
  • Find the alternate regulator. Ideally, you have it clipped or retained somehow, in a consistent place. I frequently verify (several time per dive) that my alternate is precisely where I expect. With sidemount, it's clipped to my d-ring, at my right-shoulder. With my pony, I leave it clipped to the bottle near the neck.
  • Free that regulator if necessary. I like my secondary to both be breakaway (for emergencies) & clipped.
  • Grab both regulators. One in each hand. You should generally keep a regulator in each hand until you are breathing off the secondary.
  • Remove Primary, Insert Secondary. It helps to take a moderate breath before hand, though you may not always have that luxury in a scenario like your regulator is kicked out of your mouth.
  • Purge. A quick tap of the purge button is enough to remove water. You can also purge by blowing out, but I try to tap the purge to develop good habits for emergencies. If you do accidentally inhale, but not too quickly, you might get a mouth-full of water that you can spit out, but probably won't inhale the water.
  • Breathe
  • Secure unused regulator. If it's on a regulator-necklace, youre good. Depending on your setup, you might tuck the hose under your shoulder harness, clip it, etc
 
My brother and I had similar creations... tad more complex... somehow got a Scott air pac. Tried using the full face mask with hip regulator... that doesn't work worth beans even if you remove the positive pressure spring..
But my dad has a lathe. Surely and old tire tube shrader valve, a pipe for barrel and half a old plastic yo yo. Machined it up... tire tube for a diaphragm and basically built an old Poseidon reg. (Never saw one before).
It did work... but terrible work of breathing.(like a straw).
Half the fun was building it...
When we did get proper gear.. we had to make our own canister lights mr13 bulbs abs pipe, hose barbs,cable and spark plug boots... we definitely got better on the lathe
 

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