What feature is included in the oxygen hose attachment to ensure functionality if the OBOGS fails?

The feature included in the oxygen hose attachment to ensure functionality in the event of OBOGS failure is the anti-suffocation valve. This component is critical for pilot safety, as it allows for a continuous supply of oxygen even if there is a malfunction in the onboard oxygen generating system. The anti-suffocation valve works by providing a path for oxygen to flow from a source outside the system, preventing hypoxia and ensuring that the pilot has breathable air.

In scenarios where OBOGS experiences a failure, the anti-suffocation valve activates to permit airflow, which is essential for maintaining the pilot's ability to function effectively at altitude. This safeguard ensures that pilots do not suffer from oxygen deprivation during critical flight operations.