Resmed AirFit P10 Nasal Pillow Replacement Cushion used for the treatment of sleep apnea, snoring and upper airway resistance syndrome. The nasal pillow insert cushion is replacement seal that can be changed if your CPAP mask starts to leak air. All of the quality replacement nasal pillows will work with the standard frame so therefore you may want to purchase the fit pack option, which includes multiple sizes, if you are unsure of your correct size, allowing you to obtain a custom fit.