The Rule LoPro 900 Automatic is a fully automatic low profile Bilge Pump with a 900 gallons per hour capacity. Designed for tight spaces, the height of the pump is only 2-1/4". It features a threaded discharge nozzle to which you can attach either a straight or a 90 degree fitting (included). In addition, you may use the tricuspid check valve (included) on the straight fitting to minimize the back flow of water. The entire discharge body swivels up to 180 degrees for ease of installation. The hose attached can also swivel 360 degrees to route the hose perfectly. The pump features a sensing switch to control the pump. Unique to this pump are two automated settings, a high setting where the pump turns on when the water reaches 1-3/4" and a low setting where the pump turns on when the water reaches 1". In addition, another switch setting puts the pump in electronic automatic mode, where the pump checks for water by briefly turning on every 2-1/2 minutes. If water is detected, the pump stays on until the water is removed. If no water is detected, then the pump turns off.