The HC385 Humidifier Water Chamber is designed for use with all Fisher & Paykel 200 Series CPAP systems (HC200, HC201, HC220, HC221, etc.) as well as all SleepStyle 230, 240 and 250 series systems (HC231, HC232, HC234, HC242, HC244, HC254, etc). Each chamber has two ports -- one located on the side and one positioned on the top.
The HC365 Humidifier Water Chamber is designed for use with all SleepStyle 600 Series CPAP systems (HC604, HC608, etc.). Each chamber has two ports located on the back edge. The HC365 will generally last 3-6 months prior to needing to be replaced. Maximum Capacity: 19.8 fluid ounces (600 ml) to fill line.