A Drain Valve is a mechanical device used to control the release and removal of fluids or gases from a system or container. Its primary purpose is to facilitate the drainage, maintenance, and safe operation of systems, tanks, pipelines, and equipment.

Attributes:
• Valve stem connected to the valve handle that controls the opening and closing of the valve.
• Incorporates an O-ring to ensure a tight seal when the valve is closed, preventing leaks.
• The handle that turns the valve stem, allowing for manual control of the valve.

Applications:
A Drain Valve is used in a fuel tank to remove or drain excess fuel, water, or other contaminants from the tank.