Booster Pump

[TheSaint]

It is made for paintball but I am sure you guy's could modify to suit your purposes. The Saint

Takes 125 psi @ 12 cfm and boosts to 3500 and 4500 psi. The 15/75 model is used to fill 444 cuft. bulk air tanks. I think they are running about 2800.00 which I am not sure yet as I am still waiting on a quote. Happy diving, The Saint

 

[Tank Tech]

It is made for paintball but I am sure you guy's could modify to suit your purposes.

There's another "Paintball Booster" that was discussed over on the Rebreatherworld Forum.

Im new here, so I cannot post links just yet.
To find the thread, cut/paste the following verbatim (minus the quotes) into Google:

"rebreatherworld.com: Really cheap non-o2 booster"

The manually-operated Rocket Booster has a higher ratio (50:1) and is
much less expensive when compared to the Jetsam Baby Booster.

Taken from rocket-booster.com -

MINIMUM REQUIRED SUPPLY AIR: 500psi
RECOMMENDED SUPPLY AIR: 1500psi

This booster's 50:1 pressure ratio means -

_90psi DRIVE + 500psi SUPPLY = 4500psi
100psi DRIVE + 500psi SUPPLY = 5000psi​

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