What should be done with a full tank showing a visual inspection sticker that is four years old?

The correct approach for a full tank displaying a visual inspection sticker that is four years old is to perform a visual inspection before it is filled again. Visual inspection stickers indicate that the tank has been checked for its integrity and safety, but there are regulations that specify how often these inspections need to take place. In many jurisdictions, the standard is to have a visual inspection done annually, meaning that after four years, the tank has exceeded the general recommended timeframe for such an inspection.

Therefore, before using the tank, it is essential to conduct a new visual inspection to ensure that there are no damages or issues that would compromise its safety when diving. This proactive approach helps prevent accidents and ensures compliance with safety standards within the diving community.

The other options do not accurately reflect the necessary steps regarding tank safety and diving regulations. For example, while international waters may have different regulations, this does not address the safety concerns for using outdated equipment. Condemning the tank outright without first verifying its condition through a visual inspection would be premature. Lastly, the requirement for a new hydrostatic test is generally applicable only under specific conditions, such as if significant damage is suspected or if the tank hadn’t been filled in a long time; however, it doesn’t automatically apply simply due