Search  for anything...

Rule 25SA, 12V Automatic Bilge Pump - Fully Submersible - 500GPH

  • Based on 707 reviews
Condition: New
Checking for the best price...
$79.50 Why this price?
Save $40.49 was $119.99

Buy Now, Pay Later


As low as $13.25 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Huge Time Sales

Arrives Oct 17 – Oct 21
Order within 16 hours and 7 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Size: 500 GPH


Style: 12 Volt


Pattern Name: Pump


Features

  • Peace of Mind: Automatic checks every 2.5 minutes ensure continuous reliability; the pump runs for only 0.5 seconds per cycle, minimizing energy use while offering constant protection against unexpected water intrusion for your boat. A standard pump and float switch activate when water reaches 2" (5cm), while Rule automatic bilge pumps activate at 5/8" (1.6cm) and drain water down to 1/4" (0.6cm) for superior water removal.
  • Energy Efficiency: With a low daily power consumption of just 0.20 amps, this automatic bilge pump provides environmentally friendly water removal, significantly reducing your boat's energy footprint while maintaining reliability for eco-conscious marine enthusiasts.
  • Effortless Installation: Simplify setup with the threaded port design, eliminating the need for a separate float switch or third wire; this hassle-free configuration makes our automatic bilge pump for boats an ideal choice for quick and easy installation.
  • Enhanced Safety: Built-in thermal cut-off protects against overheating; this automatic bilge pump provides reliable operation under demanding conditions, ensuring your boat's water management system remains secure and hassle-free even on extended trips.
  • Durability Meets Convenience: The quick-release strainer and rugged plastic body make maintenance a breeze; ensuring longevity and ease of use, this automatic bilge pump is perfect for busy boaters seeking reliable performance without regular upkeep.

Description

Introducing the Rule Fully Automatic 500 Submersible Bilge Pump, a powerhouse solution for managing water on your boat with utmost efficiency. This cutting- edge automatic bilge pump features fully computerized control, providing seamless and reliable water removal without the need for constant monitoring. With a rugged plastic construction, it ensures durability even in harsh marine environments. The built-in check valve prevents backflow, offering peace of mind while safeguarding your equipment. Easily installed thanks to a threaded port, this bilge pump eliminates the need for a separate float switch, simplifying the setup process for both novice and experienced boaters. Operating at 12V DC, this bilge pump offers an impressive output of 31 liters per minute (7 gallons per minute), effectively handling sizable water volumes with minimal energy consumption-only 0.20 amps per day. The pump performs automated checks every 2.5 minutes, running briefly to ward off potential issues, enhanced by a thermal cut-off to prevent overheating. Its vented body design prevents air locking, ensuring continuous efficient operation. Ideal for small craft and larger vessels alike, this 12 volt submersible bilge pump optimizes space with dimensions of 107mm high by 64mm by 74mm, making it a convenient addition to any marine bilge space. Whether out on open waters or docked, this boat bilge pump promises reliability and performance, boosting your confidence when navigating through challenging weather or water conditions. By choosing the Rule Fully Automatic 500 Submersible Bilge Pump, experience not only superior functionality but also the assurance that your boating adventures remain safe and dry.

Brand: Rule


Color: Black


Material: ABS, Nylon


Style: Music


Product Dimensions: 7"L x 7"W x 3"H


Power Source: Corded Electric


Item Weight: 12.8 ounces


Maximum Flow Rate: 8.33 gpm


Maximum Lifting Height: 1.75 feet


Voltage: 12 volts


Power Source: Corded Electric


Flow Rate: 8.33 gpm


Maximum Lifting Height: 1.75 feet


Voltage: 12 volts


Material Type: ABS, Nylon


Item Highlight: Easy Clean Strainer - Low Power Use - Check Valve & Thermal Cut-Off - Ideal for Boats -107mm x 64mm x 74mm


Color: Black


Product Style: Music


Item Dimensions L x W x H: 7"L x 7"W x 3"H


Item Weight: 12.8 ounces


Brand Name: Rule


Model Number: 3004.78


Global Trade Identification Number: 86


Manufacturer: RULE


Number of Items: 1


UPC: 042237104786 779423392510


Manufacturer Warranty Description: Please contact us if you experience any issues within 30 days of receipt.


Unit Count: 1 Count


Specific Uses For Product: SportingGoods


Included Components: Rule 25SA Electronic Sensing Bilge Pump - 500 GPH


Item Type Name: Rule 25SA Electronic Sensing Bilge Pump - 500 GPH


Manufacturer Part Number: 25SA


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 17 – Oct 21

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


  • Good Piece of mind
Size: 500 GPH
Bought this pump to replace the same one that was already in the boat. Install was easy and is where I came to find out that my original pump wasnt bad, the previous owner had wired it incorrectly that it was in manual override mode all the time. So in short I have a back up pump now.... So kudos for the original pump holding up for manual operation whenever the boat was on. The auto sense feature is a nice piece of mind. ... show more
Reviewed in the United States on June 11, 2026 by D. McMahon

  • Works great so far
Size: 500 GPH
One thing people should know is that it detects the presence of water by running the pump. If there is no load on the pump, it decides there no water and turns off. It turns on about once every 2.5 minutes for about 1 second. This probably doesn't apply to any of you, but I installed this in an antique 1956 Lyman Islander wooden boat. It has a 6 volt positive ground electrical system. Therefore, I had to mount a separate 12v battery. I chose a 6 Amp-Hour Lithium battery pack. It pumped a good amount of water as a wooden boat leaks a lot when you first launch. I also ran my fish finder/depth sounder off it. In three weeks, the battery has not been drained. So power use doesn't seem to be a problem. Sorry the pic doesn't actually show the pump, but it does show the little battery I'm using to power it. It has a wire for controlling it manually. I put a momentary switch it for forcing it to run. This is a great feature. The automatic works so well I have never needed it, but I can use it to check the battery voltage because I added a volt meter to the circuit to check to see if the battery needs charging. All in all - great pump. Easy to clean, quiet, pumps lots of water. ... show more
Reviewed in the United States on July 12, 2020 by Kevin Stokes

  • Didn’t last a year
Size: 500 GPH
Intstalled product on 10/20/2020.Automatic float quit working 9/20/2021
Reviewed in the United States on September 23, 2021 by Southern Illinois rock hunter

  • Great pump when it works.
Size: 500 GPH
Great product. Pump turns on for a second every 2.5 minutes, detects if it moved any water and continues till bilge is dry, then repeats the process. like any bilge pump, the challenge is to keep it from corroding. These units typically don't survive the warranty period so keep your receipt. Problem is the shaft seal eventually allows vapor into the electronics' area and the circuit fails. I keep a spare pump. The bilge is kept down nicely, so how water vapor gets in is a mystery. I've cut the unit apart and the copper corrosion is apparent. Unit is al but bullet proof. An expensive solution is to cut apart a new unit, pull the motor out and connect the motor wire and ground from the failed unit to the new unit you have cut and mounted in a dry area. You will be connecting the new unit's always on wire and the intermittent wire to the motor wire from the failed unit. Eventually that motor will fail, but there may be a way to connect one of the spare motors ... show more
Reviewed in the United States on December 20, 2019 by billm

  • Works great!
Size: 500 GPH
Works great, tested it after installation by putting a garden hose in the bilge and dumping in probably 3-4 gallons, several different times. The Auto mode sensed the presence of the water and pumped it all out and then shut itself off. Exactly the behavior I want! I needed to run a third line to my boat's dash since the previous pump was only on/off and not auto/on/off but it was worth the hour of time and the cost of a 2-pole marine switch. Now when I launch to go fishing, I can just put the bilge in Auto and forget about it. ... show more
Reviewed in the United States on July 14, 2019 by Bublanski

  • Auto feature doesnt work.
Size: 500 GPH
Everything is wired up properly to the 3 way rocker switch, manual works but runs constant and never shuts itself off after 2.5 mins, auto side doesnt kick on at all even when submerged. Very disappointed
Reviewed in the United States on June 25, 2026 by Product received was different than advertised

  • Great customer service
Size: 500 GPH
The flow seemed very low since installed new. I finally got around to checking it and it was 15.5seconds to fill a 1 gallon water jug. That means it’s only doing approximately 4 gallons per minute and 240 gallons per hour. Not even close to 500gph. Voltage is good, strainer is clean and clear. I pulled the pump out of the hull and put it in a clean tub of water for testing. This is a very important product and fairly pricey to be failing so soon! Hopefully the seller will reach out and do something about this. UPDATE 3/13/23 xylem Is sending a replacement pump. ... show more
Reviewed in the United States on March 11, 2023 by Shelby Mcbee

  • Awesome
Size: 500 GPH
Love these pumps! I made solar set ups for all my dinghy’s and they’re always dry
Reviewed in the United States on January 4, 2026 by Timothy O.

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...