Vintage Double Hose

I just received a complete La Spirotechnique Mistal Narguile, but without the manual.
Can any body help me out wit a copy of the manual or most important, the correct setting of the pressure delivered from the reduction valve at the surface.
There is a red dot marking at 15 bar, but is it the pressure the assistant at the surface shall obtain at all time?

Regards

Sniox

That's a beautiful setup you have. I've just recently submitted pdf's on "Building your own hookah" and "improving your rig." You might find some information in "improving your rig" that you can apply to your setup. These pdf's are in the download section of this site.