SDI Open Water Scuba Diver Practice Exam 2025 - Free Scuba Diver Practice Questions and Study Guide

The correct action before removing the regulator from your scuba cylinder is to turn the air all the way off and ensure that the low pressure inflator hose remains connected. This procedure is crucial for safety and to prevent accidental air loss.

When you turn the air off, you stop any air supply from the tank to the regulator, minimizing the risk of inhaling air while the regulator is disconnected. Furthermore, keeping the low pressure inflator hose connected helps maintain the integrity of the buoyancy control device (BCD) system. If the inflator hose is detached, there’s a possibility of air escaping from the BCD, which can lead to an uncontrolled ascent or other buoyancy issues when re-entering the water.

By following this step, you ensure that all safety protocols are adhered to, promoting a controlled and safe diving experience. Other options do not address the immediate need to securely manage the air supply from the cylinder before equipment disconnection.