Laguna Automatic Bilge Pump 1100 GPH 12V With Integrated Auto Switch For Hands Free Boat Bilge Drainage

Meet the Laguna Automatic Bilge Pump 1100 GPH, 12V — a compact, reliable solution engineered to keep your boat’s bilge dry with minimal effort. Its built-in sensing system eliminates the need for a separate float switch, delivering truly automatic operation so you can focus on the voyage rather than monitoring water levels. This pump is purpose-built for marine environments, delivering steady performance when you need it most.

• Automatic, no float switch required — Laguna’s integrated switch sensing activates the pump as water rises and stops it when the bilge is dry, streamlining maintenance and reducing potential failure points.
• 12V DC, 1100 GPH, 4A draw — Core pumping power with efficient electrical draw (about 48 watts) and a safe 2.5A fuse requirement, designed for reliable operation on standard boat electrical systems.
• Water-cooled, submersible motor — A durable, marine-grade motor engineered for continuous, under-bilge use and tougher conditions, with ISO 8846 MARINE certification for splash-resistant environment compatibility.
• Removable clip-on basket filter — A simple, debris-trapping screen that stays secure during operation and is easy to clean or replace without removing the pump.
• High-impact plastic housing — Built to withstand the rigors of boat life, resisting corrosion and providing long-term reliability in wet, humid conditions.
• 1 1/8" (29 mm) discharge hose — Standard hose size for straightforward plumbing connections to your bilge system or vented loop arrangements.
• Compact footprint — 151 x 78 x 100 mm (L x W x H) fits tight spaces under decks and in cramped bilges without compromising performance.
• Part Number 31158 — Clear identification for easy replacement or upgrade within your vessel’s existing bilge setup.

This pump is ideal for sailors, boat owners, and marine enthusiasts who want a dependable, maintenance-friendly bilge solution. Its automatic operation is perfect for sailboats, motor yachts, fishing vessels, pontoons, or any craft where bilge water risks must be managed hands-off. The Laguna 31158 stands out by combining an automatic sensing system with a water-cooled motor and a convenient clip-on filter, reducing downtime and extending pump life compared to basic non-automatic units.

Practical use scenarios include routine marina drainage, engine bilge management after washing down the deck, or emergency responses during rain-heavy passages. For upgrades or replacements, the integrated auto-switch system simplifies installation and ensures consistent behavior across varying water levels and boat layouts.

Specifications at a glance:

• Capacity: 1100 GPH
• Voltage: 12V DC
• Current draw: 4A
• Fuse: 2.5A (12V)
• Discharge hose: 1 1/8" (29 mm)
• Dimensions: 151 x 78 x 100 mm (L x W x H)
• Part: 31158