Rain Bird 1/2" Automatic Drain Valve. It allows water to drain from pipes automatically to prevent freezing in cold climates. Made of plastic with a pipe thread connection, it has a pressure rating of 10 psi and a maximum working temperature of 100°F. This in-line valve features one outlet and is compatible with PVC pipe material. Install at a low point in your system to drain pipes after each use, eliminating the need for a gravel drain. Its unique two-stage screening process prevents grit from siphoning back into pipes, ensuring efficient drainage.