Controller – It is an electronic device that controls the entire irrigation system. The controller activates the equipment based on the watering schedule programmed for the plants in a yard. Valves – They regulate the water flow between different parts of the irrigation unit. A sprinkler system typically has several valves, each controlling a watering zone of the landscape. Pipes – Irrigation lines transport liquid from the water source to the sprinklers. They are often made of polyvinyl chloride (PVC) or galvanized steel. The pipes are usually buried underground but can sometimes be placed above ground. Sprinklers – The sprinkler heads distribute water to the plants in patterns that range from circular to rectangular. They provide a variety of coverage options for different areas of the lawn.