Pressure regulator - How to do..

[robse]

Hi.

My static sub will have an air tank with an air pressure of about 100 psi when fully filled. The valves and hose system needs a pressure of about 20 psi in order to surface the sub from about 6½ ft. depth.

Does anyone have an idea on how to regulate the pressure from the air tank down to the needed 20 psi regardless at what stage the pressure in the air tank is at? (Like an automatic pressure-regulator-kind'a thing..)

[bigdave]

Check Mikes Subworks. He sells

Check Mikes Subworks. He sells a regulator for Co2. I think it is around 40 PSI. I use it in my Nautilus and it works fine.