ResMed H5i Flip Lid Seal

Quick answer: This is the genuine ResMed replacement flip lid seal for the H5i heated humidifier water tub (part 36892). The seal is the silicone gasket that sits in the lid of the water tub and keeps it airtight when closed. A worn, stretched, or damaged seal can cause air leaks, water leaks, or reduced humidification — replacing it restores a proper seal without buying a whole new tub.

What’s included

• 1 × ResMed H5i flip lid seal (part 36892)

Water tub, lid, and humidifier not included.

About this part

The H5i water tub has a flip-top lid, and the seal is what makes that lid airtight. It does more work than it looks like: it keeps pressurized air inside the humidifier path, stops water from escaping when the tub is handled, and ensures the humidifier delivers moisture as intended.

Because it’s silicone and gets wet, warmed, cleaned, and flexed every single day, the seal is one of the first parts to wear out. Typical signs: the lid feels loose, you notice water seeping, humidification seems weaker than it used to, or the seal looks flattened, stretched, discolored, or torn. Swapping in a fresh seal is a cheap fix compared with replacing the whole tub.

Key features

• Genuine ResMed seal (36892) — correct fit for the H5i water tub lid.
• Restores an airtight seal — fixes air and water leaks at the lid.
• Maintains humidification performance — no pressure loss at the tub.
• Inexpensive fix — cheaper than replacing the entire water tub.
• Easy to fit — seats into the lid; no tools required.

Specifications

Care & replacement

Clean the seal along with the water tub per the H5i user guide, and let it dry completely before reassembly. Seat it evenly in the lid groove — a seal that isn’t fully seated will leak. Inspect it regularly and replace it if it looks flattened, stretched, cracked, torn, or discolored, or if the lid no longer closes snugly.

Frequently asked questions

What does the flip lid seal do?
It’s the silicone gasket in the water tub’s lid that keeps the tub airtight when closed, preventing air and water leaks.

Which humidifier does it fit?
The ResMed H5i heated humidifier water tub (S9 platform).

How do I know it needs replacing?
Common signs: the lid feels loose, water seeps out, humidification feels weaker, or the seal looks flattened, stretched, or torn.

Is the water tub included?
No — this is the seal only. The H5i cleanable tub is part 36800.

Do I need a prescription?
No — small replacement parts like this do 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.

Use with a compatible ResMed H5i humidifier tub according to the device’s user guide. Ensure the seal is fully seated before use.