The Pump Start Relay automatically synchronizes your pump for watering with your automatic sprinkler timer. It is compatible with 24 volt sprinkler systems and has a weather resistant plastic case for outdoor installation. Brand Name: Orbit Sub Brand: WaterMaster Length: 4.5 in. Product Type: Pump Start Relay Width: 6 in. Height: 8 in. Packaging Type: Boxed Material: Plastic Number in Package: 1 pk Color: Gray.