Orbit Underground 51240 0.50 in. Plastic- Auto Drain Valve

This sprinkler system drain is great for use with residential sprinkler systems or commercial sprinkler systems. Automatic drain valves seal when irrigation system water is running and do not drain until water pressure alleviates. For all your yard sprinkler systems draining, this sprinkler system drain valve is perfect. Features and Benefits: Easily connects to the lowest point of a garden sprinkler system line, Has a �-inch MNPT (Male National Pipe Thread) connection, Acts as a supplement to winterizing sprinkler systems, Drains irrigation pipes automatically when water pressure stops..