Johnson Pump 05903-00 Cartridge Combo Automatic Submersible Bilge Pump
- 1000 GPH rated flow
- 12 volt battery powered
- 36 inch maximum lift height
- Automatic electro-magnetic float switch
- Straight and 90 degree Dura-Port elbows included
- Limited 3 year warranty
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An automatic submersible cartridge bilge pump aimed at small boats that need hands-off water removal. The listing gives no amp draw.
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ASIN: B00CUOAEIWModel: 05903-00Category: Bilge Pumps
Overview
A boat bilge is where this submersible cartridge pump works to clear water, switching on by itself through an electro-magnetic float switch. Dura-Port discharge ports and a removable check valve come with it, and the red plastic body drops in as a cartridge.
Automatic operation and the easy-to-fit discharge ports are the reasons to choose it, since no hose clamp over-tightening is needed. Amp draw and fuse size are not given, so wiring needs to be matched from the manufacturer's data.
Who it's for
Owners of small and mid-size boats who park on a mooring or trailer and want a pump that works unattended will use the float switch. Larger vessels or heavy-flooding needs call for a higher-capacity pump.
Pros and cons
- Automatic float switch operation
- Dura-Port ports reduce stress cracking
- Removable check valve
- Straight and elbow ports included
- Amp draw not listed
- Hose size not listed
- Float switch wiring details missing
Performance notes
The float switch senses rising water and starts the motor, and the check valve limits backflow when the pump stops. Flow falls as lift height goes up, so the quoted rating applies to a short lift. Battery voltage drop and hose length also cut real output.
Specifications
| Brand | Johnson Pump |
|---|---|
| Model | 05903-00 |
| Dimensions & fit | |
| Item Dimensions L x W x H | 7 x 4.5 x 7.5 inches |
| Maximum Lifting Height | 36 inches |
| Weight | 16 ounces |
| Capacity & performance | |
| Flow Rate | 1000 GPH |
| Power & efficiency | |
| Power Source | Battery powered |
| Voltage | 12 volts |
| Construction & materials | |
| Material Type | Plastic |
| Color | Red |
| Warranty & support | |
| Manufacturer Warranty Description | Limited 3 Year |
| Other details | |
| Product Style | Bilge Pump, Submersible |
Closest rivals on specs
Rule RM1100B, Auto Submersible Bilge Pumps 12V 1100 GPH AutoSense- Item Weight 1 vs 1.2 pounds (-17%)
SEAFLO 14A Series 12V 1100 GPH Automatic Low Profile Water Sensing Bilge Pump- Item Weight 1 vs 1.2 pounds (-17%)
Frequently asked questions
Is the Johnson Pump 05903-00 a manual bilge pump?
No. It is an automatic submersible pump that switches on through an electro-magnetic float switch.
What comes with the Johnson Pump 05903-00?
The description lists a straight and a 90 degree Dura-Port elbow plus a removable check valve.
Does the Johnson Pump 05903-00 need a battery?
Yes. It is listed as battery powered at 12 volts.