Vintage Double Hose

Hey everyone,

I've just acquired a Royal Mistral to complete my collection (and I'm very happy about that!!!) I opened it yesterday night and found this:


Anybody has an idea of what it is?

There is no venturi nozzle nor thread on the body to fix one, and It seems this part has been cut off from the can so my guess is this missing part was somehow replacing the nozzle to create the venturi effect, does that make sense?

Could anyone send through a picture of the original part so I can try to have it manufactured here in Valencia?

Many thanks for your help!!

It looks like the deflector of a USD Royal Mistral, the balanced attempt for a single stage regulator. Maybe the internals of the body are actually from a USD Royal Mistral. Interesting that La Spiro might have tried balancing its single stage also.


The USD Royal Mistral did not have a venturi nozzle either. Apparently the venturi was strong enough without the nozzle even to the point that a deflector was needed.

Hi Simon, many thanks for the pics, now I now what it looks like and will be able to reproduce it. It is actually a US Divers Royal Mistral (not a Spiro).
I'll check how it works without the deflector first and then will adapt a custom one (already have the brass folio to do it) to bring it back to genuine.
Many thanks again!
Cheers!