PADI Divemaster Certification Practice Exam

What is the system called in which the first stage is screwed into the cylinder valve?

1. Yoke system

2. DIN system

3. Quick-release system

4. Threaded system

The correct answer is: DIN system

The correct answer refers to the DIN system, which is an abbreviation for Deutsches Institut für Normung, the German Institute for Standardization. In this system, the first stage of the regulator is designed to screw directly into the cylinder valve, allowing for a more secure and reliable connection. This design often results in a stronger attachment, which is especially beneficial in higher-pressure scenarios. The DIN system is commonly used in many parts of Europe and in technical diving situations because it can accommodate higher pressures than other systems like the yoke. This allows divers using DIN-equipped setups to dive with greater assurance, knowing that the first stage is effectively sealed against the valve. Other systems, like the yoke system, involve a clamp mechanism that attaches to a valve through a different method, which may not provide the same level of pressure security as the DIN system. Therefore, understanding these connection types is crucial for divers, particularly when considering the conditions they’ll be diving in.