AUTOMATIC AIR VENT VALVE
AUTOMATIC AIR VENT VALVE is the type of isolation ball valve, barrel strainer, air vent, and purge valve that helps prevent corrosion by automatically releasing trapped air in wet fire sprinkler systems.
It can automatically vent air without leaking, eliminating the need for drip pans or drain lines.
Here is the CAD file for free download: Automatic Air Vent