An irrigation system is a series of pipes, valves and sprinklers that deliver water to different areas of your landscape based on a schedule you set up. These systems can be as simple as one or two zones with a single valve controlling them, or they may cover multiple areas such as a front yard and back yard. The more valves in an irrigation system, the more complicated it becomes. The sprinkler head has a valve that opens when the timer sends a signal and closes when the timer sends another signal. When this happens, water flows through the... read full review »