Kane Any reg will do. I tend to favour a simple piston design first stage. Second stage is not required and should be replaced by a PRV just in case of creeping interstage pressure. Piston regs will deliver gas at a greater capacity than the suit inflation.They are cheap to get hold of, very simple to service and are reasonably compact. Old Aquarius valve (USD) are easily adjusted via the screw end. Scuba-pro Mk II can be adjusted with shims and differing spring pressures but not really required to alter if you have a good SI valve on the suit. Enjoy the warmth Regards Dave Crockford.