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. This chamber's design is similar to the discontinued HC345 except with sleeker styling. The HC385 will generally last 3-6 months prior to needing to be replaced.