The Ports Cap for the Quattro™ FX, Mirage Activa™, Mirage Activa™ LT, Mirage™ SoftGel, Mirage Micro™, Mirage Kidsta™, Mirage Vista™, Ultra Mirage™ Nasal, Ultra Mirage™ II Nasal and Mirage Liberty™ is the replacement cap used to seal the oxygen tubing ports on most ResMed masks. The ports allow oxygen tubing to be attached when supplemental oxygen is added...