Rule Rule-Mate 500 Fully Automated Bilge Pump – 12V – RM500B

The Rule-Mate 500 (RM500B) is a compact, efficient 500 GPH fully automatic bilge pump designed for small boats that need reliable, hands-free bilge protection. With its built-in solid-state float switch, the pump automatically activates when water enters the bilge—eliminating the need for external switches or additional components.

Using Rule’s advanced electronic water-sensing technology, the RM500B detects water levels without moving parts, delivering long-term durability and reducing the risk of mechanical failure. Its 12V motor provides dependable pumping performance while keeping power usage low, making it ideal for runabouts, inflatables, tenders, and other small vessels with limited space.

Constructed from corrosion-resistant marine-grade materials, this pump is built to withstand harsh marine environments. The integrated backflow-prevention check valve helps reduce water re-entry, ensuring your bilge stays drier. Compact, quiet, and easy to install, the Rule-Mate 500 offers dependable automatic bilge management for peace of mind on every trip.

Key Features:

• 500 GPH Pump Capacity: Perfect for small boats, tenders, and inflatables

• Fully Automated: Integrated solid-state float switch—no external switch needed

• 12V Operation: Compatible with standard marine electrical systems

• Electronic Water Sensing: No moving float components for increased reliability

• Backflow Prevention: Built-in check valve minimizes unwanted water return

• Ignition Protected: Safe for use in engine spaces and fuel areas

• Compact & Durable: Corrosion-resistant construction for long service life

• Low Power Draw: Efficient motor designed for smaller vessels

• Model RM500B: Trusted Rule Marine performance in a small footprint

The Rule-Mate 500 Fully Automated Bilge Pump – RM500B is the ideal solution for boaters who need compact, dependable, hands-free bilge protection in any environment.

Features:

• State-of-the-art water sensing technology
• Pump turns on when water level rises and shuts off when water is removed
• No float switch required
• 500 GPH/1893LPH
• Anti-fouling impeller
• Submersible
• Ignition protected
• Includes back flow preventer
• 3-year warranty