Rule Mate RM500B 500 GPH Fully Automated Bilge Pump, 12V, NEW OEM

$74.99

SKU: 785365
1 in stock (1 available)
  • Free Shipping Lower 48

    Free Shipping Lower 48

  • 30-Day Returns

    30-Day Returns

  • 90-Day Warranty

    90-Day Warranty

Manufacturer:

Model Number: 500 GPH

Series: 12V

MPN: RM500B

Listed Item Condition: New/New Other

Product Details:

We recently acquired a large inventory of overstock items, these items are in the manufacturer's original packaging, but may have minor cosmetic blemishes from storage, (See Photos).

Operating capacity: 500 GPH (1,893 LPH) open flow.
Voltage: 12 Vdc operation.
Amp draw: 1.8 Amps (2.4 Amps at 13.6Vdc).
Fuse size: 4 Amp recommended fuse.
Discharge size: 3/4 inch (19 mm) threaded port or 3/4 inch hose barb adapter.
Included fittings: One straight barb and one 90-degree angled barb.
Activation height: Turns on automatically when water reaches 2 inches (5 cm).
Shut-off height: Turns off completely when water drops to 3/8 inches (0.9 cm).
Power usage: Zero standby battery drain until water triggers the pump.
Sensor technology: Field-effect sensor detects water but ignores pure motor oil.
Backup logic: Enters a 2.5-minute temporary cycle mode if the sensor is blocked by debris.
Backflow prevention: Integrated check valve stops water from running back into the bilge.
Airlock protection: Internal hidden air vents stabilize pump priming.
Safety feature: Built-in thermal cut-off protection prevents overheating.
Maintenance: Snap-off strainer base allows fast cleaning.
Dimensions: 4.4 inches high, 6.0 inches wide (including discharge port), 2.9 inches deep.
Shaft material: Corrosion-resistant stainless steel.

What's Included:

  • Rule Mate RM500B 500 GPH Fully Automated Bilge Pump, 12V, NEW OEM

Return Info: 30-Day Returns

Warranty Info: 90-Day Warranty

Dimensions: 9 × 7 × 4 in, Weight: 2 lbs

Shipping Info: Free shipping applies to items being delivered within the contiguous United States (lower 48). HI, AK, PR, and all other US Territories, and International locations will have shipping calculated during checkout.

Terms:

All items sold at Max Marine Outlet come as you see in the pictures provided, with only the parts and accessories stated in the description section named “What’s Included”. IF YOU DO NOT SEE SOMETHING YOU EXPECT TO BE INCLUDED IN THE DESCRIPTION WE PROVIDE, IT WILL NOT BE INCLUDED. Read all descriptions thoroughly. There are times when a display is used only to show the item being sold is functional and working properly. In this case, these displays are not included. If you have any questions feel free to reach out. We always want to be transparent with our customers and fully disclose any information regarding the products we sell.

Categories Plumbing, Hydraulics, & Ventilation » Pumps, Parts, & Accessories
QTY Available 1
Date Added Aug 24, 2026
Location

O014409

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