Features: brand new and high quality High quality material , it is made of Abs material , safe healthy ,hygiene ,durable , you can use at assure. The High Flow humidifier is uniquely suited to enhance gas hydration for the new generation oxygen concentrators. The water bottle humidifier universal for 7F-5,7F-5W,8F-5,8F-5W,8F-3A,8F-3AW,8F-5A,8F-5AW,8F-3C,8F-3CW,9F-3,9F-3W,8F-3ZW. There are a small hole at the bottom of the tube of the humidification cup,the humidification cup must be opend and cloeaned regularly ,otherwise the air output of the oxygen generator will be reduced and the serivice life of the oxygen generator will be affected . Water bottle humidifier,bottle wall finish is high, not easy to scale, easy to clean and use. Specifications: Material:ABS Size:As Picture Showes Package Includes: 1 Piece Water Bottle Humidifier note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item.