This knob alters the airflow inside the regulator, making breathing either easier or more difficult. Turning the knob enables and disables something called the Venturi Effect, which regulator designers take advantage of to assist breathing. Read more
Scuba regulators:
• Illustrated Guide to the Basic Parts of a Reg
• DIN vs Yoke Regulators
• 8 Types of Regulator Mouthpieces
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