The inline filter is suitable for CPAP devices. It is used in combination with the machine's built-in inlet filter to deliver very . The outer diameter of the connector end: 25mm. The inner diameter of the female connector end: 22 mm. Suitable for 22 mm pipe making machine. Installation and replacement are quick and easy. The filter is connected between the air or outlet of the machine and the . Best Results: Keep the air inhaled by the CPAP machine clean for the best therapeutic effect. A 6 . Does not contain . Each filter is individually and sealed. Material:ABScolour:As ShownPackage Contents:6 x Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Please allow slight errors due to manual measurement. Please make sure you don't mind before bidding. Color may vary depending on your monitor, please understand. Note: Hello, please pay attention to your shipping address when purchasing products. If your delivery information (e.g. name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly