Rule LoPro 900GPH Bilge Pump - Automatic

The Rule LoPro 900GPH Bilge Pump – Automatic is a fully automatic low-profile bilge pump engineered for vessels where space is at a premium. With a compact height of just 2.25 inches, this automatic bilge pump delivers 900 gallons per hour capacity, making it ideal for keeping water out of engine compartments, bilge wells, and tight storage areas on fishing boats, cruisers, and offshore vessels. The LoPro 900 combines Rule's proven reliability with a form factor that fits where traditional pumps cannot.

The pump's low-profile design addresses a real-world challenge aboard modern vessels: limited vertical clearance in bilge spaces. The automatic float switch activates the pump as water level rises, requiring no manual intervention—critical for unattended operation during rough conditions or overnight anchorages. The discharge assembly features a threaded nozzle that accepts both straight and 90-degree fittings (included), allowing flexible hose routing around equipment and structural obstacles. The included tricuspid check valve prevents backflow on the straight fitting, protecting against siphoning and water reentry into the bilge when the pump shuts down. This modular discharge approach is standard across Rule's bilge lineup, meaning replacement parts and alternative fittings are readily available through marine suppliers.

This pump is built for weekend fishermen who need dependable automatic water removal and serious offshore anglers who demand reliable backup bilge capacity. Weekend boaters appreciate the automatic operation during extended stays in the slip, while offshore crews value the 900 GPH capacity as a secondary pump alongside larger primary systems. The Rule brand carries established reputation for durability in marine applications, where corrosion, vibration, and continuous saltwater exposure are the norms. Installation integrates with standard 1.25-inch hose connections, fitting common marine bilge plumbing configurations.

Bilge pump capacity and automatic switching are regulated by ABYC (American Boat and Yacht Council) standards, which inform marine insurance and classification society requirements. The 900 GPH specification positions the LoPro as a solid mid-range option—larger than emergency manual pumps but smaller than primary electric systems on larger vessels, making it suitable for centerline or backup installations on boats in the 25–45-foot range. Proper sizing depends on bilge volume, seacock locations, and expected water ingress scenarios; a bilge pump calculator based on your vessel's dimensions and intended use will confirm whether 900 GPH meets your actual requirements.