Stage and Deco Regulators: Why DIR Keeps Them So Simple

A DIR stage or deco regulator is deliberately simple: one first stage, one second stage and one compact pressure gauge. No octopus, no inflator hose. It stows along the bottle and deploys cleanly, and a regulator for oxygen or nitrox 50 must be set up for oxygen service. We set yours up with you in class.

By Jeremiah Gardner · Last reviewed October 27, 2026

At a gas switch, everything has to be confirmed. The depth. The gas. The bottle. The regulator in your hand.

That's hard enough when the regulator is tidy. It's much harder when the hose is caught under the rigging, the gauge is flapping somewhere you can't see it, and the second stage is jammed against the clamp.

The fix isn't more skill. It's a simpler regulator.

What's on a stage or deco regulator?

Almost nothing. That's the point.

One first stage.
One second stage, on a hose that reaches your mouth from a bottle on your left side and stows along the bottle without loops.
One compact pressure gauge, held close to the first stage so it never swings.

No octopus. No inflator hose. No console.

Every hose you add is another thing to snag, leak or fail, on the bottle you're breathing from when you're most committed.

What does a good setup look like?

You reach for it and it's there. You read the gauge and the number is clear. You stow it and nothing stands off the bottle.

And you can deploy it with one hand, without looking, every time.

The exact hose lengths and how they route are part of UTD's configuration, and we set them up with you in class, on your bottles.

Stage or deco: what's different?

The layout is the same. The gas isn't.

A deco regulator breathing oxygen or nitrox 50 has to be cleaned and assembled for oxygen service. Talk to your regulator technician before a regulator goes on an oxygen bottle, and don't swap regulators between bottles on the boat just because one is closer.

And the bottle carries its gas on the outside, not on the regulator. See Deco Bottle Marking and why DIR divers don't color-code regulators.

Isn't it just a spare regulator?

The comfortable belief: a stage reg is a spare. Any old regulator will do.

The truth: it's the regulator you breathe when you're most committed. Deep on a stage, extending your bottom time. Or at a deco stop, when going straight up isn't an option.

That's not the place for a hand-me-down reg with a mystery hose.

Set it up once, then switch to it a hundred times

Gas switching, bottle handling and the failures that come with them are the core of the Stage and/or Deco Bottle Extension. For the bottle itself, read Stage Bottle Rigging.

So, can you deploy yours with one hand? Without looking? Every time?

Frequently asked questions

Does a stage regulator need an octopus or inflator hose?

No. One second stage and one compact gauge. Every extra hose is something else to snag, leak or fail.

Is a deco regulator set up differently from a stage regulator?

The layout is the same. A regulator for oxygen or nitrox 50 must also be cleaned and assembled for oxygen service.

What hose lengths should I use?

We set up stage and deco regulators to UTD's configuration in the Stage and/or Deco Bottle Extension, fitted to you and your bottles.

Can I use an old spare regulator as a stage reg?

Only if it's serviced, reliable and, for a deco gas, set up for oxygen service. It's the regulator you breathe when you're most committed.