The foam cushions fit easily on the headset tubing of nasal cannula to get a very comfortable fit and reduce chafing and tissue irritation over the ear.
John Bunn JB0180-CF Replacement Cabinet Filter for OptiumTM Oxygen Concentrator
Oxygen Concentrator Filter Kit for Invacare Perfecto2 Oxygen Concentrator. This kit contains one foam cabinet filter, one straight barb bacteria filter, and one Universal Compressor Filter. For use on the Invacare Perfector2 oxygen concentrator. Due to hygiene purposes, this item is non-returnable.