The M Series Humidifier O Ring is a replacement O ring for use with only the R1 chamber for M Series Humidifiers. The R1 chamber has a replaceable O ring and features a blue latch. Later versions have a black latch. If there is any doubt, please see the M Series Replacement Humidifier Chamber which features a universal kit which can be used with any M Series humidifier.
This is the O Ring only and does not include any other items.
Compatibility Note: Respironics made updates to the M Series chamber a number of times during its life span. This O ring is for use only with the original R1 chamber for M series humidifiers. These chambers have a replaceable O ring and a blue latch on the chamber. Later versions have a built in gasket and a black latch. If unsure, the Universal Kit which will work with any M Series Humidifier can be viewed here.
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