Rule 25DA, Standard Bilge Pump, Non-Auto, Submersible,500 GPH, 12V
- 500 GPH, 8.33 gpm flow
- 12 volt supply, low amperage
- 3/4 inch threaded discharge port
- Check valve and thermal cut-off
- Non-auto, switch not included
- 12.8 oz, 7 x 6.9 x 4 inches
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A manual submersible bilge pump with a thermal cut-off and a check valve against backflow. It needs a separate panel or float switch, which the listing says is not included.
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ASIN: B01LZ5HQ2WModel: 25DACategory: Bilge Pumps
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Overview
On a small boat with a switch panel, this Rule pump lies low in the bilge and pushes water out through a threaded port. The check valve blocks backflow, and the thermal cut-off protects the motor from overheating.
The reason to buy is a compact, low-amperage pump with built-in protection and a vented design that avoids air lock. The limitation is that it is non-automatic: you need a panel switch or float switch, and the listing does not include either.
Who it's for
Owners of small boats with switched wiring will find the pump straightforward. Those who want automatic operation, or who lack a switch, should choose an automatic model or add a float switch.
Pros and cons
- Low amperage draw
- Thermal cut-off protects the motor
- Check valve prevents backflow
- Threaded discharge port
- Switch not included
- Warranty window is short
- Material entry looks inconsistent
Performance notes
The check valve stops water draining back into the bilge when the pump stops. Flow is rated at the stated figure, and it drops with hose length and lift. A thermal cut-off turns the motor off before it overheats if it runs dry or jams.
Specifications
| Brand | Rule |
|---|---|
| Model | 25DA |
| Dimensions & fit | |
| Item Dimensions L x W x H | 7 x 6.9 x 4 inches |
| Outlet | 3/4 inch threaded |
| Weight | 12.8 ounces |
| Capacity & performance | |
| Flow Rate | 500 GPH (8.33 gpm) |
| Power & efficiency | |
| Voltage | 12 volts |
| Construction & materials | |
| Material Type | Stainless steel |
| Warranty & support | |
| Manufacturer Warranty Description | Contact within 30 days of receipt |
| Other details | |
| Operation | Non-auto (manual switch needed) |
| Protection | Thermal cut-off, check valve |
Closest rivals on specs
SEAFLO 06 Series Automatic Submersible Bilge Pump- Flow Rate 8.33 vs 12.5 gpm (-33%)
Attwood WaterBuster Portable Submersible Pump- Flow Rate 8.33 vs 3.33 gpm (+150%)
Frequently asked questions
What do I need to install the Rule 25DA bilge pump?
It has a 3/4 inch threaded discharge port and runs on 12 volts. A panel switch or float switch is needed and is not included.
Does the Rule 25DA turn on automatically?
No. The title says non-auto.
What does the check valve do?
It prevents backflow, per the description.
Is the pump submersible?
Yes. The title says submersible.