Great Lakes deco reg?

[matt t.]

I use Apeks DS4's and DST's with ATX and TX 50 2nds. All my regs are inter-changeable, and use the same service kits. The 2 regs you mention are NOT known as cold water regulators. Most of the time on tech dives you are spending more time on the deco regs than you are on back gas regs. Don't cheap out on them. I have also heard of people switching diaphragm 1st stages underwater (fresh water) with no ill effects on the reg upon later inspection. IMO, you want to try to standardize your gear to keep a smaller parts inventory and interchangeability should the need come up. YMMV