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Rule-Mate Automatic Submersible Bilge Pumps 12V RM500B- 500GPH with Auto Sense Intelligence - Thermal Cut-Off & Backflow Prevention - Compact Design for Boats - Easy Install Threaded Discharge

Based on 195 reviews
Condition: New
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$75.36

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Availability: In Stock.
Fulfilled by Amazon

Arrives Sunday, Nov 8
Order within 15 hours and 33 minutes

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At a glance

Condition
New
Style
500 GPH
Model
RM500B
Dimensions
8.5"L x 6.75"W x 3.75"H
Weight
16 oz
Color
White
Material
Plastic
In the box
HuntingAirsoft and Paintball;Binoculars;binoculars

Features 5

  • Enhanced Efficiency: This Rule-Mate bilge pump delivers up to 10% more water flow than previous models while using the same amperage, providing quicker drainage without added energy consumptionperfect for maintaining a dry and safe vessel efficiently.
  • Smart Auto Activation: Featuring advanced Auto Sense Intelligence, this automatic pump activates at 2 inches and shuts off at 3/8 inches, offering true hands-free operation that protects your boat from flooding and lets you enjoy peace of mind on the water.
  • Reliable Backup System: In the event the sensor is blocked, the pump enters a backup mode, cycling every 2.5 minutes to manage excess water. This feature ensures your boat remains protected even if the primary detection system becomes obstructed.
  • Advanced Safety Features: Built-in thermal cut-off protection prevents overheating, while hidden air vents reduce airlocks, enhancing performance, reducing maintenance needs, and extending the life of your 12V submersible bilge pump in all conditions.

Description

The Rule-Mate Automatic Bilge Pump is designed to deliver superior water removal performance while maximizing efficiency and reliability. Available in 500, 800, and 1100 GPH models, this 12V submersible pump offers up to 10% more flow than previous versions—without increasing amperage. Its compact design fits easily into tight bilge spaces, making it ideal for a wide range of vessels. Equipped with Auto Sense Intelligence, the pump automatically activates when water reaches 2 inches and shuts off at 3/8 inches, ensuring fully automated, hands-free operation. In case the sensor becomes blocked, the pump enters a backup cycle mode, activating every 2.5 minutes to prevent flooding and protect your vessel. Additional features include built-in thermal cut-off protection to prevent overheating and hidden air vents that help eliminate airlocks, reducing wear and ensuring smooth operation. The threaded discharge system allows for quick and easy installation, saving you time and hassle during setup. Whether you're a weekend boater or a serious marine enthusiast, the Rule-Mate bilge pump offers peace of mind with dependable water removal, low maintenance, and enhanced safety. It’s the perfect upgrade for keeping your boat dry, secure, and ready for every adventure.

Specs 23

Brand Rule
Color White
Material Plastic
Style Music
Product Dimensions 8.5"L x 6.75"W x 3.75"H
Power Source Corded Electric
Item Weight 16 ounces
Maximum Flow Rate 8.33 gpm

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 8

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


Beware of auto function
Size: Standard Style: Music
Junk. Beware. Bought for the automatic function. Does not turn on automatically. Runs manually Test button doesn’t do anything. Should run after holding button for five seconds. My thirty day return is over by two weeks and didn’t realize it was defective til my boat filled with water. Better check all functions when you install. Don’t trust it. ... show more
Reviewed in the United States on February 3, 2025 by Dave

Yep get it
Size: Standard Style: Music
Perfect and works flawlessly
Reviewed in the United States on June 19, 2026 by Sylvester hamby

TOTAL JUNK
Size: Standard Style: Music
Zero. First one failed in a month. Replacement failed in a month. Don’t waste your money spend it somewhere else on something that actually works.
Reviewed in the United States on August 31, 2026 by Amazon Customer

Nice replacement
Size: Standard Style: Music
Great product easy to install
Reviewed in the United States on September 20, 2026 by Kris Berquist

Bilge pump, great reliability and function.
Size: Standard Style: Music
An excellent bilge pump that works perfectly. I replaced my old Rule pump with this one only to find out that I had a bad ground wire connection in the boat. The old pump was fine, but I put the new one in and it worked great and snapped into the mount from the old pump. Now I have a spare, though based on the reliability of this pump, I'll probably never need the spare. ... show more
Reviewed in the United States on June 2, 2025 by Dr. Steven Hankins, Pastor

Works well
Size: Standard Style: Music
Works as described- no complaints
Reviewed in the United States on July 29, 2026 by DIY guy

Excelente.
Size: Standard Style: Music
Cumplió las expectativas.
Reviewed in the United States on July 21, 2026 by Luis Tracana

Automatic feature failed after 2 years light service
Size: Standard Style: Music
This is the second one that has failed. The unit test button worked, I heard the relay click but no water pumped unless I used the manual wire. This was the same failure as before. Pump itself worked manually just not automatically. Last time I buy one. I purchased a simpler pump for 1/3 the price from another vendor. Bad design. ... show more
Reviewed in the United States on September 10, 2026 by Firecracker
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