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• Ensure the exhalation vent holes are clear. Check Valve Function WARNING DO NOT use the mask if the valve flap is damaged or missing. NOTE: If the valve flap is damaged, distorted, or torn, it should be replaced with a new part. NOTE: For this procedure, refer to SECTION C in supplemental sheet provided. 1. Connect a standard 22mm bore, 6-foot tube from your flow generator to the hose swivel by pressing the tube end over the swivel. 2. Turn On the flow generator. Part No 1130237 5 Invacare®Tw