Oberdorfer 406MG-03-UGY Gas-Powered Macerator Pumping That Goes Where Power Doesn't
When sewage, wastewater, or holding-tank contents need to move and there is no electrical outlet nearby, the Oberdorfer 406MG-03-UGY steps in as a self-contained solution. This close-coupled unit pairs a bronze flexible impeller pump with a 3-1/2 HP Briggs and Stratton gas engine, so it can be carried to a dock, campsite, or job site and put to work immediately. The neoprene impeller inside does the heavy lifting: as it spins, its flexible blades squeeze liquid through the pump chamber and out the discharge port, handling sewage, wastewater, and other neoprene-compatible liquids without the metal-to-metal wear that shortens the life of gear-style pumps.
Because the pump is self-priming, it doesn't need to be flooded before use, and it can draw liquid from up to 15 feet away once the impeller is wet and the suction line is airtight. That makes it a practical choice well beyond boats: campers, travel trailers, and mobile homes rely on units like this one for holding-tank pump-outs, and it works just as well for general utility transfer, dewatering, or emergency cleanup where portable power matters more than a dockside connection. Marine owners still get the bilge, washdown, baitwell, and sewage-transfer performance the 406M series is known for, but the gas engine means the pump isn't tied to shore power or a boat's electrical system.
Long-term ownership costs stay low because the pump is built to be serviced rather than replaced. The impeller and internal cam wear first and can be swapped out in the field, restoring the pump close to its original performance without buying a new unit. Bronze construction and a stainless steel shaft resist corrosion in fresh and salt water alike, and flushing the pump with fresh water after each use keeps the neoprene impeller in good condition for seasons of dependable, portable pumping.
Key Features
- 3-1/2 HP Briggs and Stratton gas engine, close-coupled directly to the pump for cord-free, off-grid operation
- Marine-quality bronze pump body and stainless steel shaft resist corrosion in fresh and salt water
- Flexible neoprene impeller with only one moving part — no gears, no metal-to-metal contact, minimal noise
- Self-priming design with suction lift up to 15 feet once primed
- Integrated macerator wheel breaks down solids before discharge for smoother flow
- Configurable rotation direction, fixed as uni-directional once set to match the installation
- Serviceable design — impeller and cam are field-replaceable without swapping the whole pump
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Handles fresh water, salt water, sewage, and mild chemicals compatible with neoprene
Applications
- Boat sewage and holding tank transfer
- Dockside and marina pump-out stations
- RV, camper, and travel trailer holding tank pump-out
- Campground and mobile home waste transfer
- General utility and dewatering tasks away from electrical power
- Emergency water or wastewater transfer
- Bilge, washdown, and baitwell pumping aboard boats
- Agricultural and job-site liquid transfer where portable power is needed
Specifications
- Pump Type: Close-coupled flexible impeller (rotary positive displacement) macerator pump
- Construction: Bronze pump body with stainless steel shaft
- Impeller Material: Neoprene rubber
- Power Source: 3-1/2 HP Briggs and Stratton gasoline engine
- Inlet Port: 1-1/2 inch Male NPT or 2 inch hose connection
- Discharge Port: 1 inch Female NPT or 1-1/2 inch hose connection
- Suction Lift: Up to 15 feet once primed
- Operating Temperature Range: 45°F to 180°F (7°C to 82°C) for the neoprene impeller
- Rotation: Configurable at installation; uni-directional once set
- Seal Type: Mechanical seal
Frequently Asked Questions
Q: Can the Oberdorfer 406MG-03-UGY run without being primed first?
No. The pump must be primed before startup, and running it dry — even briefly — will damage the neoprene impeller. Fill the pump chamber with liquid and make sure the suction line is airtight before starting the gas engine.
Q: What liquids should never be pumped through this unit?
Avoid gasoline, severe solvents, and acids, since these will break down the neoprene impeller. Stick to fresh water, salt water, sewage, and other liquids that are chemically compatible with neoprene.
Q: Does the pump need an external power source to operate?
No. The 3-1/2 HP Briggs and Stratton gas engine is close-coupled to the pump, so the entire unit is self-contained and can run anywhere a fuel supply is available, without shore power or an electrical hookup.
Q: How far away can the pump draw liquid from?
Once the impeller is wet and the pump is fully primed, it can achieve a suction lift of up to 15 feet, provided the suction line is airtight and a foot valve is used at the inlet.
Q: What should be done with the pump after each use to extend its life?
Flush the pump with fresh water after each use, especially after pumping salt water or sewage, and drain it before exposure to freezing temperatures to protect the neoprene impeller and internal components.
CLRMarine
