Product description Specification: Item Type: Oxygen Extension Tube Color: Transparent Material: PVC Applicable to: Oxygen and hydrogen machines Size: Approx. 1.5 m / 5 Foot Package List: 3 x Oxygen Extension Tubes 3 x Connectors Feature: 1. Extended Reach: Move freely with a 5-foot tubing for unrestricted use of your oxygen equipment. 2. Premium Quality: Durable, transparent materials ensure safe oxygen delivery, resistant to deformation and pressure. 3. Convenient Compatibility: Easily connect to various oxygen devices with the included connector for a hassle-free experience. 4. Clear Oxygen Monitoring: Transparent design allows easy monitoring of oxygen flow, ensuring a constant understanding of your oxygen supply. 5. Portability and Versatility: Lightweight and portable, suitable for medical care, home use, and travel, ensuring access to oxygen wherever you are. How to use Oxygen Tube？ Check Equipment: Ensure the oxygen machine or oxygen tank and oxygen tube are intact. Connect the Oxygen Tube: Attach the oxygen tube to the outlet of the oxygen machine or oxygen tank, making sure it is secure. This oxygen tube interface can adapt to all home oxygen concentrators. Connect the Extension Tube: Attach one end of the extension tube to the outlet of the oxygen machine or oxygen tank. Connect the other end of the extension tube to the oxygen tube, ensuring all connections are tight. Wear the Nasal Cannula: Insert the nasal cannula into the nostrils, loop it over the ears, and adjust the sliding clip for comfort. Adjust the Flow Rate: Turn on the oxygen machine or oxygen tank, and adjust the oxygen flow rate to the level recommended by your doctor. Check Oxygen Flow: Ensure the oxygen is flowing smoothly. The presence of airflow at the end of the nasal cannula indicates oxygen delivery. Maintain Cleanliness: For reusable oxygen tubes, clean and store them properly after use. For disposable oxygen tubes, ensure correct disposal. These steps ensure the proper use of the oxygen tube and the safety and comfort of the user. I hope this helps.