Which of the following is classified as ANU Category II?

The classification of ANU Category II refers to equipment that is critical for safety and emergency procedures in diving. Explosive valves are categorized in this way because they play a vital role in managing high-pressure systems and can help prevent dangerous situations, such as explosive decompression. Their function directly impacts the safety of divers, making them essential components in the context of dive operations.

In contrast, regulators, BCDs, and scuba tanks, while crucial for underwater breathing and buoyancy control, do not fall under this specific category due to their differing roles in diving safety and equipment classification. Regulators control air flow from tanks, BCDs assist with buoyancy control, and scuba tanks are simply storage units for compressed air. Their classification might align with other categories, but not with the specific requirements of ANU Category II.