Toro 1/2 In. MPT Automatic Drain Valve

Use 1 or more drain valves on each zone to drain water from pipe to prevent damage from freezing. Drains sprinkler pipe automatically when system is turned off and seals when system is turned on. Corrosion resistant construction and has a 1/2 In. Male thread. Opens at 6 psi (pounds per square inch) and seals at 12 psi.