What is the recommended position of the dust cap when rinsing a regulator?

When rinsing a regulator, the recommended position for the dust cap is closed. This practice is important for several reasons.

Firstly, having the dust cap closed prevents water from entering the first stage of the regulator, which is crucial for maintaining the integrity and functionality of the internal components. Water ingress can lead to corrosion and other mechanical issues that could affect the regulator's performance and safety.

Secondly, keeping the dust cap closed helps protect the regulator from debris and contaminants that may be present in the rinse water. This ensures that the regulator remains clean and reduces the risk of damage when not in use.

By following the guideline to keep the dust cap closed during rinsing, divers can preserve the equipment's longevity and ensure reliable operation during subsequent dives.