The Orbit 57009 2 HP Irrigation Pump Start Relay is designed to synchronize an irrigation pump with a sprinkler controller. It operates using 24 VAC leads that connect the controller to the relay, and is capable of actuating 120 VAC pumps up to 1 HP and 230 VAC pumps up to 2 HP. The relay is compatible with 24 VAC irrigation controllers from Orbit, Hydro-Rain, and other major brands. It is suitable for use with a variety of water sources, including wells, ponds, and bore holes, and is intended for outdoor irrigation use with cold water only. The enclosure is constructed from water-resistant plastic and is designed for outdoor installation. Color: Gray. Weight: approximately 1.32 lbs. Compatible pump voltages: 110V and 220V. UPC: 046878570092.