The ResMed AirSense 11 water chamber is a reliable and easy-to-use humidifier chamber designed to provide a comfortable breathing experience. This chamber is designed to hold up to 300mL of water and is compatible with the ResMed AirSense 10 and AirCurve 10 series of CPAP machines. It features an easy-fill lid and is designed with a top-fill design, making it simple to refill and clean. The chamber is made of durable plastic and is designed to be leak-proof, ensuring a safe and secure fit. The chamber also features a secure locking mechanism, making it easy to attach and remove from the CPAP machine. The ResMed AirSense 11 water chamber is the perfect choice for anyone looking for a reliable and easy-to-use humidifier chamber for their CPAP machine.