Compatible With Nearly All Cpap  Bipap And Bilevel Systems For Every Manufacturer On The Market * Smooth Interior And A Corrugated Exterior For Excellent Flexibility And Unrestricted Interior Flow Characteristics * Tpr Cuffs To Reduce Tearing * Low Memory To Avoid Kinks * Latex-free *  Dimensions: 22mm Cuff And 19mm Inner Diameter Of The Tube.