Are HOG D1 1st stages upstream or downstream?

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The other problem that could shut off air supply quite completely would be a broken/ collappsed main spring in the 1st stage, but I never heard of that.
 
Balanced downstream 2nd stage.

Only upstream 2nd stage I know are Poseidon... the Jetstream/Thor/Odin models, as well as the Xstream.
 
Richard, I'm fairly sure that the new Oceanic/Hollis SE regs are upstream as well....but I could be wrong.
 
The other problem that could shut off air supply quite completely would be a broken/ collappsed main spring in the 1st stage, but I never heard of that.

Actually I'm not sure that would completely shut off air, although a diaphragm first would certainly be the most likely to do so. With flow-by pistons (like the MK2) there's enough downstream pressure on the seat to have some sort of minimal IP above ambient even without a spring, and someone on this forum once tried to operate a MK5 without a spring and supposedly it did deliver some air.

I'm thinking if you sucked hard enough on a 2nd stage you'd reduce the pressure in the IP chamber to less than ambient which would collapse the diaphragm enough to push the seat off the orifice, at least theoretically. I wouldn't want to try it under water!
 
The other problem that could shut off air supply quite completely would be a broken/ collapsed main spring in the 1st stage, but I never heard of that.

Or if the turret detached from the body of the first stage.
 
https://www.shearwater.com/products/peregrine/

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