Order # 38506400 Manufacturer# HC345S Brand SleepStyle Manufacturer Fisher & Paykel Application CPAP Humidification Chamber For Use With Models HC220 and HC230 Series Specifications 13.5 Ounce Capacity, Disposable UNSPSC Code 42272221 Replacement water chamber for the Fisher & Paykel SleepStyle 220 and 230 Series of humidified CPAP machines Humidifier chambers should be replaced every six months to ensure optimum performance