OEM genuine Philips Respironics white disposable ultrafine filter that is used by the Respironics M-Series, System One, and SleepEasy CPAP, Auto CPAP and BiPAP machines. These are for the M-Series, System One, and Sleep Easy cpap and BiPAP machines only; they will not fit the older "Legacy" CPAP machines. One filter per pack.
*** These filters fit the System One, Sleep Easy, and M-Series CPAP machines, they measure approximately 7/8 inch x 1 3/4 inches. They DO NOT fit the older "legacy" REMstar machines made prior to the release of the M-Series.
| These filters fit the M-Series machines that look like this: |  | NOT the older style REMstar and BiPAP machines that look like this: |  |
