What is a key characteristic of a vapor recovery adaptor in a Phase I vapor recovery system?

The key characteristic of a vapor recovery adaptor in a Phase I vapor recovery system is that it helps prevent vapor leakage. This component plays an essential role in maintaining the integrity of the vapor recovery process by ensuring that vapor is properly contained and directed back into the storage tank rather than being released into the atmosphere during fuel transfer. This is crucial for minimizing environmental impact and compliance with regulations regarding air quality and emissions. By effectively sealing the connection between the fuel nozzle and the tank, the adaptor reduces the risk of vapor escaping, thereby optimizing the vapor recovery system's efficiency and functionality.