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Rubber Impeller Bronze Pump

115v 3/4HP 1" TEFC
Model Number
oberdorfer 405m rubber impeller pump

Oberdorfer 405M-04M35

Oberdorfer rubber (flex) impeller pump with solid cast bronze housing. Close coupled Rubber Impeller Pumps are made of high quality bronze for maximum corrosion resistance. The rubber 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 or engine support the shaft. Model 405M has a mechanical seal. Impellers are made of Neoprene rubber, Buna N impellers are available on request. (405M-07)

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.

Rubber impeller pump can run in both directions. You can install an ON/OFF/REV switch on to the motor.


Liquids handled by Rubber Impeller Pumps with standard Neoprene impellers are primarily fresh or salt water and water solutions. Rubber Impeller Pumps are not suitable for pumping gasoline or solvents. Buna N (405M-07) impellers can handle oil contaminated water and kerosene at reduced impeller service life. Liquid temperature range is from 40o F to 140oF. If freezing conditions are expected, the pump should be drained by loosening the cover screws and the pump chamber should be filled with methyl alcohol based antifreeze. Viscous liquids and oils can not be pumped with Rubber Impeller Pumps.


This model does NOT have the optional vacuum switch. Do not run dry. Self priming after being "wet".

More Information
Model Number 405M-04M35
part number 405M-04M35
Series Sewage Transfer Macerator
Max Flow (GPM.) 25
Max Flow GPH 1500
TDH Maximum (Ft) 40
TDH Maximum (PSI) 18
Horse Power (HP) 3/4
Horsepower (IE .5, 1, 1.5, 20) 0.75
Inlet Connection Type FNPT
Inlet (In.) 1
Outlet Connection Type FNPT
Outlet (In.) 1
Wetted Materials 304SS, Bronze
Elastomers / O-ring Neoprene
Voltage (V) 115/230
Voltage (Range) 110-120/220-240
Phase (Ø) Single (1)
Motor Frequency 60
Motor TEFC
Speed (RPM.) 1725
Motor Frame 56C
Self Priming Yes
Max Operating Temperature (F) 140
Max Particle Size (In) 1.0000
Viscosity Glycerine 880.00 cp 5000.00 ssu
Shaft 304SS
Mechanical Seal Face Carbon-ceramic
Mechanical Seal Type Single
Coupling Y
Other On initial start-up, pump must be primed to prevent dry-running of the impeller. Shown with optional vacuum switch. Includes cord and plug 5-15A.
Cord Length (Ft.) 6
Drain No
Port Rotation Yes
Country of Manufacture United States
Weight (Lbs) 39.000000
Warranty (YRS.) 1
GPM Of Water At 20 Feet Of Head 24
GPM Of Water At 40 Feet Of Head 22