Quick answer: This is the genuine ResMed flip-top lid and silicone seal for the H4i heated humidifier water chamber. It serves two purposes: as a replacement cover for your H4i humidifier, or as an upgrade that lets an older HumidAire H3i humidifier work with H4i water chambers. The package includes the plastic cover plus the silicone seal beneath the tube connector. Compatible with all H4i heated humidifiers.
About this part
The top cover closes and seals the H4i water chamber, with the tube connector on top where your CPAP tubing attaches. A worn, cracked, or ill-fitting lid can cause air leaks, noise, and poor humidification — a fresh cover and seal restore an airtight fit and proper performance. This cover fits both the dishwasher-safe and standard H4i water chambers.
It also allows you to upgrade an older HumidAire H3i humidifier (on older S8 machines) to use H4i water chambers. Important: once you replace the H3i's top cover with this part, it will no longer be compatible with the original H3i water chambers — you'll use H4i chambers going forward.
Key features
- Genuine ResMed flip-top lid + silicone seal — complete replacement cover.
- Fits all H4i heated humidifiers — dishwasher-safe and standard chambers.
- Airtight seal — reduces leaks and restores proper humidification.
- H3i upgrade path — lets a HumidAire H3i use H4i water chambers.
- Includes the seal — some sellers omit it; this package includes it.
Specifications
| Specification | Detail |
| Product type | Humidifier water chamber top cover + seal |
| Compatible with | All ResMed H4i heated humidifiers |
| Upgrade use | Converts HumidAire H3i to use H4i chambers |
| Includes | Flip-top lid + silicone seal |
| Note | After H3i upgrade, original H3i chambers no longer compatible |
| Water chamber | Sold separately (H4i standard chamber #26952) |
| Brand | ResMed |
Frequently asked questions
What's included? The plastic flip-top lid and the silicone seal that sits below the tube connector.
Which humidifiers does it fit? All ResMed H4i heated humidifiers (both dishwasher-safe and standard water chambers).
Can it upgrade my H3i humidifier? Yes — it lets an older HumidAire H3i use H4i water chambers. Note that after upgrading, the original H3i water chambers will no longer be compatible, and you'll need an H4i water chamber (sold separately).
Does it come with the water chamber? No — this is the lid and seal only. The H4i water chamber (#26952) is sold separately.
Do I need a prescription? No — replacement humidifier parts do not require a prescription.
Can I get it delivered in Brooklyn or shipped nationwide? Yes — Task Supply Corp offers USPS shipping throughout the continental U.S., plus local pickup and delivery in Brooklyn and all five boroughs of New York City.
Use with a compatible ResMed H4i humidifier according to the device's user guide.