This item has been discontinued by the manufacturer and is no longer available. It is listed here for reference only.
This is the Philips Respironics brand OEM replacement AC power supply for the System One 50 series of CPAP and BiPAP machines. Please note that this power supply fits the earlier version of the PR System One series of CPAP machines that use the smaller barrel connector. If in doubt, refer to the model number on the underside of the machine - it will end in the digits "50" if it is a 50-Series, versus "60" for the newer machines that use the larger connector.