It has an X-ray opaque line

stretch to the desired tension

helps create a seal between the tube's outer wall and the trachea to direct airflow through the inner lumen

Pressurized flow effectively removes dirt and debris with better control and less waste

Reflux Relief System, Large, Height 5' 11" and Up External Pain Relief It has an X-ray opaqueThe MedCline Reflux Relief System, includes the Advanced Positioning Wedge and Therapeutic Body Pillow, for 100% natural relief from nighttime acid reflux. Validated in five independent clinical trials, the Systems components work together to comfortably create and maintain the ideal inclined + left side sleep position for optimal relief. MedCline has been proven to be the most effective treatment for heartburn, regurgitation, coughing, choking,