The F20 QuietAir Elbow with Swivel is the replacement elbow and swivel for ResMed AirFit F20, AirFit F20 for Her, AirTouch F20, and AirTouch F20 for Her Full Face Mask. The F20 Elbow functions as a QuietAir diffuser to reduce the noise created by CPAP therapy and achieve a night of peaceful and quiet sleep. This elbow releases the same amount of breath similar to the standard elbow. (1)