Replacement nasal cushion for the ResMed AirFit N10 Nasal CPAP Mask and the AirFit N10 Nasal CPAP Mask.Replacing CPAP Nasal cushion frequently can assist in eliminating residue buildup that cause infections. So, replace your CPAP Nasal Cushion for the ResMed AirFit N10 Nasal CPAP Mask at least every 90 days to protect your health.