Rule 25SA, 12V Automatic Bilge Pump - Fully Submersible - 500GPH
- 500 GPH, 8.33 gpm flow
- 12 volt, automatic operation
- 1.75 foot maximum lift
- Check valve, thermal cut-off, easy-clean strainer
- 107 x 64 x 74 mm body, 12.8 oz
- ABS and nylon, black
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An automatic submersible bilge pump that checks the bilge on its own schedule. Lift height is low, so it is for shallow bilges and short hose runs.
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ASIN: B01LZSYF42Model: 3004.78Category: Bilge Pumps
Overview
Mounting low in the bilge, this Rule pump senses water electronically and starts itself, so no separate float switch is needed. Its vented body prevents air lock, and a threaded port takes the discharge hose.
The reason to buy is automatic control in a compact pump with built-in protection and a strainer that is easy to clean. Low power draw suits battery use. The limitation is the lift height, and one data field names the style as music, which is clearly a listing error.
Who it's for
Small craft owners who leave a boat on a mooring will use the self-starting function. Larger boats, long discharge runs and anyone needing high capacity should look at stronger pumps.
Pros and cons
- Automatic, no float switch needed
- Thermal cut-off protects the motor
- Check valve stops backflow
- Vented body avoids air lock
- Low maximum lift
- Warranty window is short
- Style field is wrong
- Modest flow for larger boats
Performance notes
The pump runs a short self-test at regular intervals and starts when it senses water, so it protects a boat without a float. Flow falls as lift increases, so the low lift limit matters. A vented body lets air escape rather than locking the impeller.
Specifications
| Brand | Rule |
|---|---|
| Model | 3004.78 |
| Dimensions & fit | |
| Maximum Lifting Height | 1.75 feet |
| Body size | 107 x 64 x 74 mm |
| Weight | 12.8 ounces |
| Capacity & performance | |
| Flow Rate | 500 GPH (8.33 gpm) |
| Power & efficiency | |
| Voltage | 12 volts |
| Construction & materials | |
| Material Type | ABS, nylon |
| Color | Black |
| Warranty & support | |
| Manufacturer Warranty Description | Contact within 30 days of receipt |
| Other details | |
| Operation | Automatic, electronic sensing |
Closest rivals on specs
Attwood WaterBuster Portable Submersible Pump- Flow Rate 8.33 vs 3.33 gpm (+150%)
- Maximum Lifting Height 1.75 vs 3.3 feet (-47%)
SEAFLO 06 Series Automatic Submersible Bilge Pump- Flow Rate 8.33 vs 12.5 gpm (-33%)
- Maximum Lifting Height 1.75 vs 8.2 feet (-79%)
Frequently asked questions
Do I need a float switch with the Rule 25SA?
No. The description says it eliminates the need for a separate float switch.
Can the Rule 25SA run on a battery?
Yes. It runs on 12 volts DC, though the power source field says corded electric.
How high can it lift water?
The listing gives a maximum lift of 1.75 feet.
What does it do on its own?
The description says it performs automated checks every 2.5 minutes and runs briefly.