How many oxygen masks are located in each toilet?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

In aircraft safety, oxygen supplies in all key areas, including lavatories, are arranged for quick, reliable access. Lavatories carry their own oxygen masks so a person inside can don protection immediately during a depressurization, without waiting for the main cabin devices. Having two masks per toilet provides redundancy and ensures there’s a spare if one mask is difficult to access or deploys improperly, which helps maintain breathable oxygen in that small, enclosed space quickly.

So two masks per toilet is the practical, standard setup: enough to cover immediate needs with a backup, while avoiding unnecessary clutter or overpacking the limited space in a lavatory.