Oberdorfer 209M

209M Oberdorfer

Description: 209M 1 1/2 x 3/8" Rubber Impeller Pump

Model#: 209M | Series#: 209M

Price: $35000

Availability:Ships within 2 to 3 weeks Click for Parts Breakdown
Ships from US
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Close-coupled Rubber Impeller Pumps are made of high quality bronze for maximum corrosion resistance.

The rubber impeller is either directly attached to the stainless steel motor shaft or the impeller is mounted on a separate stainless steel shaft, which is counter bored on the outer end in order to slide over the carbon steel motor shaft. Ball or sleeve bearings in the motor support the shaft. Model 406M has a mechanical seal. Impellers are made of Neoprene rubber, Nitrile impellers are available on request. Flexible blades on the periphery of the impeller provide the pumping action. While the impeller rotates, the liquid between the blades is continuously squeezed out into the discharge port by a cam located inside the pumping chamber. The flow may be throttled or shut off for a short period without the need of a relief valve.

  • All Bronze Construction
  • Large Vent Openings Separate Pump and Motor
  • Stainless Steel Motor Shaft
  • Motor Shaft Slinger Protects Motor Bearings
  • Rubber Motor Grommets for Noise Isolation
  • Macerator Wheel and Impeller Easily Replaced
  • Removable Base


2” slip-on hose section with 1 ½” NPT standard pipe male thread. All suction connections must be air tight to achieve lift.


3/4” external garden hose thread with 3/8” NPT standard pipe thread internal.


Will handle sewage, waste, toilet paper, cigarettes, cigars and all maceratable solids of approximately 1 inch size. Will not handle fruit pits, hard plastic utensils, prophylactics, cloth or fabric sanitary napkins.


12 volt D.C. high torque, 18 amps. Intermittent duty cycle. Do not run pump dry. 24V and 32V also available.


Self priming up to 4 ft.  Up to 20 ft. uphill discharge or up to 50 ft away.  (Use large diameter garden hose- ¾”- for best results.)  A 30 gallon holding tank can be emptied in less than 4 minutes.


Liquids compatible with neoprene can be pumped including fresh and salt water solutions and mild chemicals. Do not pump severe solvents or acids. When possible, flush pump with fresh water after each usage. Nitrile impellers can handle oil contaminated water and kerosene at reduced impeller service life. Extremes of cold and heat will affect impeller life. Limits of 40° to 140° F should be observed. Do not allow liquid in pump to freeze. Drain pump by loosening cover screws. Use methyl alcohol based anti-freeze compounds such as Zerex, Shell Zone, Pyro Permanent, Permagard, Dowgard.


Suction lift of 15 feet is possible when pump remains primed (2.5 feet when suction line is empty). Suction lines must be air tight in order for pump to self prime. A foot valve at beginning of suction line is recommended.


The impeller must be replaced if it is worn out or has been damaged by debris or by running the pump dry. Symptoms of a defective impeller are low pumping pressure and low flow. To replace the impeller, remove screws and cover. Remove macerator wheel, plate and gaskets. Pull out the impeller with nose pliers or two screwdrivers. Be careful not to dent the pumping chamber with these tools. When inserting new impeller, line up fl at on impeller with fl at on the shaft. Use oil on shaft and avoid forcing the impeller onto the shaft. The impeller should also be removed for storage periods to prevent the blades from taking a permanent set.


If water drips from the weep hole or from the area where the shaft exits the pump, the seal is defective and must be replaced. While the slinger provides a first line of defense, prolonged running of the pump with a leaky seal can destroy the ball bearings resulting in catastrophic pump failure and engine shut-down. For seal replacement, the pump must be removed from the engine and disassembled in order to gain access to the seal area. Where mechanical seals are used, both components (stationary and rotating member) must be replaced at the same time. Lip seals must be pushed out of their press-fitted position and new seals pressed into place, using a sealant on the outside of the lip seal housing. Refer to exploded view drawings for seal location and part numbers for ordering purposes.


Note: These are the most frequently used pump and motor combinations.  If you have other needs, our sales reps can recommend a pump and motor for your application.

  • Utility
  • Trailers
  • Boats
  • Railroads
  • Buses
  • Motor Homes
  • Emergency
  • Campers
  • Cottages
  • Camp Sites
  • Aircraft
  • Marine Transportation
  • Recreational Vehicles
  • Land Water Cruisers
  • Commercial Pleasurecraft
Series Data
Pump TypeClose Coupled
Ports Size (NPT, inch)1 1/2 x 3/8
Max Speed (rpm)2600
Max Head (feet)28
Max Head (psi)12
Max Capacity (gpm)9
Document Title Download
Bronze OverviewClick Here to Download
Bronze Overview MetricClick Here to Download
Marine OverviewClick Here to Download
Specification SheetClick Here to Download
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