Resmed Airfit N30i CushionResmed AirFit N30i Nasal Cradle This Product DOES NOT Require a Prescription Product Description replacement cushion is the silicone seal that attaches to the nasal style CPAP mask. Facial oil build up on the silicone will break down the consistency of the cushion over time and lead to mask leak. When this occurs it is time to replace your AirFit N30i seal. The cushion seals are color coded to easily recognize the size you need to replace. The small