Replacement Bias Flow Diffuser filters for the Fisher & Paykel Flexifit 405 CPAP mask (HC405), and the Fisher & Paykel Oracle Oral CPAP mask (HC452); comes in packages of 10 filters. These filters replace the included air diffuser for popular Fisher & Paykel CPAP masks and fit directly into the elbow of the Flexifit 405 and Oracle 452.
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