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One replacement chamber for the HC200, HC201, HC220, HC221, HC233, HC234, and SleepStyle HC238 CPAP machines. Each HC285 chamber has two ports:one located on the side and one positioned on the top. The HC385 Water Chamber replaces the discontinued HC345 Water Chamber. Its design is similar to the HC345 except with sleeker styling. Capacity 13.2 fluid ounces (400 ml).