Wing Inflator Hose Routing: Singles, Doubles and the Right Post

On a single tank, the wing inflator comes off the left side of the first stage. On DIR backmount doubles, it comes off the right post, while the drysuit inflator comes off the left. That split means losing one post never takes away every way to add gas. Handling a stuck inflator is a skill you learn in training.

By Jeremiah Gardner · Last reviewed October 27, 2026

Your wing starts to hiss. Then it starts to lift.

You're rising, and you didn't ask to. What do you do in the next two seconds? Which hand moves first? Do you even know where that hose comes from?

That last question is the one most divers can't answer. And it's the one that decides how fast the rest goes.

How is the inflator routed on a single tank?

Simple. A left-side port on the first stage, up to the inflator on your left shoulder. Short run, no loop over the top of the valve.

How is it routed on doubles?

Different. It comes off the right post and crosses behind your head to the inflator on your left shoulder.

Keep it close. The hose should hug the manifold and the back of your head. If it stands up in an arch above your valves, it's waiting to catch a line, a wreck or a ceiling.

Why the right post?

It looks odd the first time. The inflator is on your left shoulder, so why not feed it from the left post?

Because the drysuit inflator lives on the left post. Put the wing on the right and you never lose both ways to add gas at once. Lose the left post and your wing still works. Lose the right and your suit still works, and the wing still has its oral inflator.

That's the same logic behind the whole doubles layout. One failure should never take everything.

What happens when an inflator sticks?

The priorities are simple to say: stop the ascent, stop the unwanted gas, keep a regulator to breathe, and keep your team with you.

How you do that depends on your rig. A single tank and a set of doubles give you different options, and some of those options change what you're breathing from. That's exactly why it isn't a page you read. It's a failure you practice, with an instructor, until your hands know the answer.

Has your inflator ever stuck?

Here's the reality check.

The comfortable belief: my inflator has never stuck. It's fine.

The truth: it only has to stick once.

And when it does, you won't have time to think about where the hose comes from. You'll either know, or you'll be at the surface wondering what happened.

Practice the failure before it happens

Inflator failures aren't drills reserved for tech courses. They're basic problem-solving, and they belong in your muscle memory before you need them. Gas failures and runaway wings are exactly what the Doubles course is built around. For fit, read DIR Hose Lengths.

So, which post feeds your wing?

Frequently asked questions

Why is the wing inflator on the right post of doubles?

It keeps the wing and the drysuit on different posts, so losing one post never takes away every way to add gas.

How long should a wing inflator hose be?

The shortest hose that reaches the inflator without tension when you turn your head, and without standing up in a loop above your valves. We fit it with you.

What do I do if my inflator sticks?

Control the ascent first, then stop the unwanted gas while keeping a regulator to breathe and your team with you. The exact response depends on your rig, and it's taught and practiced in training.

Is a stuck inflator really a risk?

Yes. A wing that keeps inflating can cause an uncontrolled ascent. It doesn't happen often, which is exactly why the response has to be practiced before you need it.