This is the replacement Flexitube Kit for the Fisher & Paykel Oracle HC452 mask and it includes the Elbow & Vented Non-Rebreathing Valve. Return On Warranty Issues Only
Specifications
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"I purchased this unit to experiment with. I have a full face mask that uses the same type valve. I purchased a nasal unit that does not have a valve, so I adapted it to the nasal mask. It didn't help ."