Rule LP900S LoPro Series Automatic Bilge Pump. 900 GPH. 12V. Designed to bring pumping power to tight spaces. Multiple modes of operation provide flexibility for a variety of applications. Choice of operational mode. Fully rotating discharge body. Choice of discharge ports supplied with each pump. Backflow prevention valve. Horizontal or vertical mounting. The LP900S model features two automated modes. The first one engages the pump when the water level reaches your desired level of either 2" (5 cm) or 1.3" (3.25 cm); and the second one checks for water by briefly turning on the pump every 2.5 minutes.