The inline filter is suitable for CPAP devices. It is used in combination with the machine's built-in inlet filter to deliver . 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 filters. Does not contain latex. Each filter is individually and sealed. Material:ABS colour:As Shown Package Contents: 6 x filters 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 . The measurement allowed is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!