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Submersible Dewatering Pump Heavy Duty

115/110v 4870GPH 2" 1/2HP
Model Number
koshin pbx-65011 submersible electric pump

Koshin PBX-65011

2" 1/2HP Heavy duty submersible dewatering pump. Electric pump for dirty water in ditches. Often found in rental shops, contractor fleets. Industrial Rubber Pump End Pumps, Equipped With a Centrifugal Switch Providing 4x the Starting torque, Allows Cooler Operation when Cycling Equipped with Air Valves for Periods of Dry Run.Avoid the Piggy Back Integrated Float Switch Connector. Just Two Bolts Outlet Can be Turned to Pump Horizontally. Perfect for Industrial, Construction, Fountains, Ponds, Pools, Irrigation, Agriculture, and Flood Prevention. Replaces PB-65011


  • Impeller and casing are manufactured from a blended rubber compound providing maximum wear resistance, up to three times over cast iron.
  • Water is channeled through the outer wall to cool the motor for maximum endurance.
  • It is compact, light-weight, easy to carry and handle.
  • Double Silicon Carbide mechanical seals run in an "oil" filled chamber of liquid paraffin to prevent damage from periods of dry running.
  • Liquid paraffin is used in the shaft seal, therefore water will not be contaminated even in the case of oil leakage.
  • The cord is 33' of uni-body construction ensuring excellent water tightness. Includes heavy duty mechanical strain relief bracket.
  • The built-in thermal protector turns off the power supply in case of overload operation thus protecting the motor. 
  • Discharge port can be positioned vertical OR horizontal. Also it is replaceable. MNPT
  • Optional Integral float switch for automatic operation available: PN FS-PBX (order separately) see below
  • Applications: Construction site, excavations, well casings and general dewatering.
  • Utilities, manhole and vault draining, loading docks.
  • Residential, draining of basements, crawl spaces and swimming pools.
  • Pumps down to a couple of inches.
  • Fits into 8" diameter holes
More Information
Model Number PBX-65011
Series Submersible Dewatering Pumps Heavy duty
Max Flow (GPM.) 81
Max Flow GPH 4860
TDH Maximum (Ft) 32
Horse Power (HP) 1/2
Horsepower (IE .5, 1, 1.5, 20) .5
Watts 400.000000
Outlet Connection Type MNPT
Outlet (In.) 2
Wetted Materials Aluminum
Elastomers / O-ring Buna-Nitrile
Voltage (V) 115
Voltage (Range) 110-120
Phase (Ø) Single (1)
Motor Frequency 60
Motor Amps (A) 8.7
Motor Hermetically Sealed
Speed (RPM.) 1725
Max Operating Temperature (F) 104
Max Particle Size (In) 0.1200
Viscosity Milk 3.20 cp 40.00 ssu
Stages 1
Shaft 304SS
Length (In.) 16
Mechanical Seal Yes
Mechanical Seal Face SiC
Mechanical Seal Type Double
Motor Bearings Ball
Other 7-1/2" diameter. Pump requires minimum hole size of 7-3/4" diameter. Motor is thermally protected. Contact PumpBiz for level switches, starter boxes and other options.
Min. Generator capacity 4000 watts.
Impeller Material Hard rubber, semi-open
Cord Length (Ft.) 33
Duty Continuous
Country of Manufacture Japan
Weight (Lbs) 36.000000
Warranty (YRS.) 3
GPM Of Water At 10 Feet Of Head 60
GPM Of Water At 20 Feet Of Head 40

Koshin pumps are the standard and known world wide in the contractor, rental, and portable pump markets as the brand to use. Most portable water pumps by Koshin feature Honda gas engines. Koshin manufactures a complete line of self priming centrifugal pumps for general transfer, high pressure and trash debris filled liquids. These pumps come in gas or diesel engine and single phase electric submersibles. Koshin is the most copied pump design coming out of China, but do not think they are the same. Use only the best, the original Koshin.

For over 70 years Koshin has continued to invest in new product testing and development. Koshin totally redesigned its production facilities in 2013 adding in house aluminum die casting, production automation, and state of the art process flow management. With a core philosophy of customer satisfaction, Koshin insures that each product off of its production line is of the finest quality. This is why we can proudly say that the performance specification found in this catalog are guaranteed minimum. This is often not the case with our competitors, who inflate actual performance values.

To further insure our valued customers that Koshin stands by our produces, we offer a 3 year limited warranty against manufactured defects. Our pumps are used and loved in 160 all over the world.

Koshin… the world’s toughest pump.