A sprinkler system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat from ...

Attach its hose to the sprinkler zone control valve ... For Your Underground Automatic Sprinkler System Some underground automatic lawn sprinkler systems require you to drain the pipes manually ...

So, if the water pressure suddenly drops off and the sprinklers no longer spray ... Valves are essential for any plumbing system, so if you notice the control valve for the sprinkler isn't working ...