Laguna Automatic Bilge Pump 500 GPH, 12V

Meet the Laguna Automatic Bilge Pump 500 GPH, 12V — a compact, marine-grade solution that keeps your bilge dry with intelligent, self-contained automation. Designed for boats of all sizes, this submersible pump blends reliability, efficiency, and easy maintenance into one dependable package.

Automatic operation you can trust

Built with an integrated Laguna Switch sensing system, this pump runs automatically without the need for a separate float switch. As soon as water rises, it activates and discharges through a 3/4" hose, then stops when the bilge is dry. This makes it ideal for coastal cruising, weekend fishing boats, sailboats, or any vessel where simplicity and reliability matter most.

Durable, upkeep-friendly design

The Laguna 500 GPH is engineered for real-world use on the water. It features a water-cooled motor for cooler operation and longer life, a high-impact durable plastic housing, and a removable clip-on basket that catches debris before it reaches the impeller. The clip-on bracket design simplifies installation and service, so you can clean the basket or replace components without a headache.

Smart, versatile wiring

With a three-wire configuration, you can run the pump in Auto mode for fully automatic bilge management or switch to Manual override when you need direct control. It’s a clean, versatile setup that helps you tailor bilge management to different vessels and scenarios.

Safety, efficiency, and durability in one pump

Mercury-free and ISO 8846 MARINE submersible, the Laguna 500 GPH prioritizes safety and compliance while delivering steady performance. The compact footprint and efficient motor design reduce battery drain—crucial on small vessels or endurance outings.

Practical details that matter

• Flow rate: 500 GPH (1890 LPH) for dependable bilge drainage.
• Voltage and draw: 12V DC, draws 1.6A; fuse size 2.5A.
• Discharge hose: 3/4" (18.5 mm) diameter for compatible hose fittings.
• Dimensions: 140 x 70 x 100 mm (L x W x H) — compact enough for tight bilge spaces.
• Housing: Removable clip-on basket with durable, impact-resistant plastic.
• Mounting: Clip-on bracket design for quick installation and service.
• Safety/Compliance: Mercury-free construction; ISO 8846 MARINE submersible.

Ideal use cases

Perfect for small to mid-sized boats, dinghies, sailboats, and runabouts where a reliable, automatic bilge pump is essential. It handles routine splashes as well as heavier inflows, providing peace of mind during rough seas or extended trips.

Tips for best results

• Mount the pump in a lower bilge area with a clear path for the discharge hose to minimize airlocks.
• Regularly inspect and clean the removable basket to prevent debris buildup that could affect performance.
• Pair with compatible 3/4" hose fittings and clamps to ensure a secure seal and steady flow.
• Test Auto mode periodically to confirm the built-in sensing system activates correctly in your boat’s typical water conditions.

Specifications at a glance

• Part number: 31151
• Voltage: 12V DC
• Capacity: 500 GPH (1890 LPH)
• Amp draw: 1.6A (12V)
• Fuse size: 2.5A (12V)
• Hose diameter: 3/4" (18.5 mm)
• Dimensions: 140 x 70 x 100 mm (L x W x H)
• Construction: Water-cooled motor, submersible, mercury-free
• Housing: High-impact durable plastic with removable clip-on basket
• Operation: 3-wire design with Auto and Manual override modes