Improved Water Chamber for AirSense 11, HumidAir Water Tub for S11 Series, 340ml Upgraded Humidifier Tub Container,Great-Value CPAP Supplies by Medihealer.

This actually works better than the original product. It seems to be a better fit for the machine.

Unfortunately I didn't read the reviews before purchasing this chamber and I wish that I had. It's tight fit but I could deal with that except it leaks badly. I filled it up hours before bedtime and noticed water all over my night table. I believed that I possibly overfilled it so I removed it from the cpap, drained some water and cleaned up only to find another puddle when I woke up. After reading the reviews I saw that others had the same experience. Returns aren't a hassle with Amazon, but the fact is that the manufacturer continues to sell this product with manufacturing flaws. It's not worth the price and the manufacturer should be ashamed.

This unit was slightly better than the official resmon11 humidifier tray. The body plastic is better and after 3 months has not started developing any cracks which the official tray does after 1 month. On the bad side is that the "hinge" is actual an L shaped click in clamp to hold the lid tight to the base. Within 1 month one side broke off and now is leaking air and eats up water at over 3 times the prior rate. If after 6 months with no body cracks in the plastic I will upgrade this to 4 stars. However the inside (front) hinge/clamp needs to redesigned to be stronger and not able to break off as easy. It also should be a sturdy roller hinge rather than a clamp. The price of this model on amazon is the same as the original resmed 11 humidifier tray.

Great product even better than the original. Must buy.

Harder to assemble, leaks like crazy (big water pool under machine the next morning), and too tight a fit into machine, so hard to remove.

I just needed a replacement as mine was old and needed replaced. There are tabs that snap off in the back when you try to close it, not hinges, and for some reason there is water leaking out of it, but I can’t tell from where. I just know my desk has had lots of water on it every morning since I bought it. Might just be a one off, but that has been my experience with it.

It works, and doesn't leak like others reported. But the fit is way to tight. It's a challenge to take it out and put back in.

Well, this one is a little different than the normal one that comes with your CPAP machine, this one actually has a top and a bottom that comes apart. Took some time to get used to it but now it works. Great there’s no water leaks. no nothing I would highly recommend doing this.