Rule 500 GPH Electronic Sensing Bilge Pump – 12V – 25SA

The Rule 25SA 500 GPH Electronic Sensing Bilge Pump is a compact, efficient, and fully automatic bilge solution—perfect for small boats, tenders, inflatables, and personal watercraft. Using advanced electronic water-sensing technology, this pump automatically checks for water every few minutes and activates only when water is detected, eliminating the need for a traditional float switch.

Delivering 500 gallons per hour, the 25SA provides dependable bilge water removal with low power consumption and quiet, vibration-free performance. The pump’s solid-state sensing system contains no moving parts, ensuring long-term durability and reducing failure points common in mechanical float switches. Designed with corrosion-resistant materials and ignition protection, the 25SA performs reliably in harsh marine environments.

Compact, energy-efficient, and easy to install, this pump is the ideal automatic bilge solution for smaller vessels needing dependable hands-free protection.

Key Features:

• 500 GPH Capacity: Reliable performance for small boats, dinghies, PWCs, and tenders

• Electronic Sensing Technology: Automatically cycles to detect water—no float switch required

• 12V Operation: Works with standard small-vessel electrical systems

• No Moving Parts: Solid-state design reduces maintenance and mechanical failures

• Low Power Draw: Efficient cycling ensures minimal battery usage

• Corrosion-Resistant Construction: Engineered for tough marine environments

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

• Quiet & Smooth Performance: Designed for low vibration and long life

• Compact Design: Fits easily into tight bilge locations

• Model 25SA: Trusted Rule engineering for small-vessel bilge protection

The Rule 500 GPH Electronic Sensing Bilge Pump – 25SA offers dependable automatic protection, minimal power consumption, and long-lasting durability—making it the perfect choice for compact bilge spaces.

500GPH Electronic Sensing Bilge Pump - 12V

In the next generation sensing bilge pumps, the 500GPH S series pump works on the principle of impeller resistance. The pump will turn on every 2-1/2 minutes for about one second to sense for water. If water is present, the pump will sense resistance and continue to run until all water is removed. After that, it will resume checking for water every 2-1/2 minutes.

Water is kept in check between 1/8" and 3/8"!!! Great idea when power conservation is needed and as an added benefit, no float switch is needed!

All that plus the added benefits of our standard bilge pump:

• Check valve included with hidden air vent to prevent airlocking
  
• True electromagnetic suppression (EMC)
  
• A built-in thermal cell that protects the pump and the vessel when things get too hot

These are the smallest automatic pumps available on the market!!!

Features:

• Completely automatic with manual override - No Float Switch Needed!
  
• Submersible and Ignition Protected
  
• High efficiency, low amp motor
  
• Stainless-steel shaft
  
• Includes backflow preventer