Quattro FX for Her Frame ReplacementThe ResMed Quattro FX Full Face CPAP Mask Assembly Kit ensures few facial contact points while maintaining exceptional stability, eliminating the need for a forehead support. The Spring Air cushion distributes pressure evenly to ensure that a tight seal is maintained even through movements. Quattro FXs 360 degree elbow joint rotates to adjust to movements during sleep. This is the replacement frame kit of Quattro FX Full Face CPAP Mask.