ResMed Ultra Mirage Full Face – Anti-Asphyxia Valve Membrane

Quick answer: This is the genuine ResMed replacement anti-asphyxia valve (AAV) membrane for the Ultra Mirage Full Face mask (part 16617) — the small silicone diaphragm inside the valve/elbow assembly. The anti-asphyxia valve is a safety feature: if airflow stops (for example the machine switches off), the valve opens so you breathe room air instead of rebreathing exhaled CO₂. This membrane is the working part of that valve — replace it if it’s damaged or lost so the safety function keeps working. It fits the Ultra Mirage, Ultra Mirage II, and Mirage Series 2 full face masks. Sold as a 1-pack (membrane only).

What’s included

• 1 × anti-asphyxia valve membrane (part 16617, silicone)

Valve/elbow assembly and mask not included — this is the membrane only.

About this part

Full face masks cover both the nose and mouth, so ResMed builds an anti-asphyxia valve (AAV) into the elbow assembly as a safety measure. During normal therapy, pressurized air holds the valve closed so all your air comes from the machine. But if the airflow stops — the machine is switched off, unplugged, or fails — the valve opens automatically, letting you breathe fresh room air rather than rebreathing the carbon dioxide trapped inside a full face mask.

The membrane (a small silicone-elastomer diaphragm) is the moving part that makes this work. It seats inside the valve/elbow assembly. Because it’s a safety component, ResMed recommends replacing it promptly if it’s torn, warped, stiff, sticky, or lost — a damaged or missing membrane means the valve may not seal during therapy (causing leaks) or may not open correctly if airflow stops.

Compatibility: it fits the Ultra Mirage Full Face, Ultra Mirage II, and Mirage Series 2 full face masks. It installs into the existing valve/elbow assembly. If the whole valve/elbow assembly is cracked or broken (not just the membrane), that’s a separate, complete assembly part.

Key features

• Genuine ResMed AAV membrane (16617) — the silicone diaphragm for the valve.
• Safety component — lets you breathe room air if airflow stops (prevents CO₂ rebreathing).
• Fits Ultra Mirage / Ultra Mirage II / Mirage Series 2 full face masks.
• Simple to fit — seats into the existing valve/elbow assembly.
• Replace when worn or lost — keeps the anti-asphyxia function working.

Specifications

Frequently asked questions

What does the anti-asphyxia valve do?
It’s a safety feature on full face masks: if airflow stops (machine off/unplugged/fails), the valve opens so you breathe room air instead of rebreathing exhaled CO₂.

What’s included?
The membrane (diaphragm) only. The valve/elbow assembly and mask are separate.

Which masks does it fit?
The ResMed Ultra Mirage Full Face, Ultra Mirage II, and Mirage Series 2 full face masks.

When should I replace it?
If it’s torn, warped, stiff, sticky, discoloured, or lost — because it’s a safety part, replace it promptly so the valve keeps working correctly.

My whole valve/elbow is cracked — is this the right part?
No — if the assembly itself is broken, you need the complete valve/elbow assembly. This is just the membrane that fits inside it.

Do I need a prescription?
No — this replacement part does not require a prescription.

Can I get it delivered in Brooklyn or shipped nationwide?
Yes — Stark Medical Supplies offers local pickup and delivery in Brooklyn and across NYC, plus USPS shipping throughout the continental U.S.

This is a safety component of a full face mask. Use it with your ResMed Ultra Mirage mask according to the mask’s user guide, and ensure the anti-asphyxia valve is intact and working before use.