Booster pressure Regulator?

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So currently I'm using high pressure banked air as drive gas. Banked air to regular cylinder, to H valve to 1st stage, to drive the booster.

So I need to go from 3000-3500 psi to 150, what u guys got for me?
Most folks use a scuba regulator.
 
Why not buy a reducing regulator. It's exactly what they're made for.
 
So I'm doing what most people do? Or is there another way to use a 1st stage direct to the booster. I also use the 1st stage to run off my doubles to fill offsite.

And so my original question, suggestion for a reducing regulator, name? Model? 4000psi ish to 100-150.
 
Ah yeah, so my original question, reasonably priced?
I guess if I could buy a Home Depot air compressor for $200 or a regulator for $450, I’d buy a little shop compressor and a spare. What size booster do you have?
 
Ah, ok, the picture is becoming more clear.

Based on the cost of a reducing regulator like those already listed, I’d buy a cheap pancake compressor instead and just be wary of the duty cycle. I’m not familiar with a cheap alternative.

High pressure bank would imply a static location, not necessarily dragging a K bottle into the jungle, so I would go with the easy answer instead and just buy a cheap shop compressor.
 
My booster certainly needs more compressor than that. I use a large shop compressor and something to clean the oil and air from its output. It provides 11 cfm at 150 IIRC duty cycle is certainly an issue.
 
https://www.shearwater.com/products/swift/

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