Gorman-Rupp S Series Model S4A1-E25 4 in. NPT Ductile Iron Widebase Submersible Dewatering Pump, 460V 3P, 900 GPM

4 in.
900 GPM
Product Type:
460V AC
642.00 LBS
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Gorman-Rupp Widebase submersible dewatering pumps tackle the big jobs. Where large solids are not a problem, these versatile models offer high-head, high-volume operation and stand up to the abuses of the worst conditions. Whatever the application - general construction, strip mining, tunnel work or general purpose - Gorman-Rupp Widebase pumps are built to operate quietly, effectively and safely.

Note: Control panel included.

Disclaimer: Please call 1-800-333-3331 for detailed information concerning your model. Parts lists can sometimes vary from pump to pump. Your serial number is critical in determining the correct parts and service requirements for your pump. Information on this page is provided for reference only.

Warning: Do not use in explosive atmosphere or pump volatile flammable liquids.


  • High Head, High Volume Solutions: Gorman-Rupp Wide Base Submersibles are designed for applications where high volume and high head are required, and large solids are not a problem - Pumps have only two moving parts and three wearing surfaces so maintenance and repairs are minimal
  • Abrasive Handling Impeller: Abrasion-resistant ductile iron and manganese bronze impellers stand up to sand, gravel and other abrasive materials - The fully shrouded impeller back reduces seal pressure and helps prevent foreign material from entering the seal cavity - Seal life is extended and operational life of the pump is increased. Optional impellers of CD4mCu are available for corrosive/abrasive applications
  • Dual Seals, Double Protection: Primary seal keeps dirty water in the pump end and prevents contamination of the oil cavity - A second "fail safe" seal provides extra protection against the possibility of damage to the motor - Positive oil lubrication enables the pump to run dry without seal damage
  • Corrosion-Resistant Stainless Hardware: Rotor shaft and all internal nuts and bolts coming in contact with the liquid are made of stainless steel to resist corrosion and pitting and extend the operational life of the pump - For severely corrosive/abrasive applications, stainless steel lifted pump models of CD4MCu are available


Pump Specifications:
  • Part: S4A1-E25 460/3
  • Series: S Series - Widebase Submersible
  • Model: S4A1-E25
  • Suction: 4 in. (100 mm.)
  • Discharge: 4 in. (100 mm.)
  • Flange: NPT
  • Flow-Rate: 900 GPM
  • Solids Handling: 0.63 in. (16 mm.)
  • Casing: Ductile Iron
  • Impeller/Rotor: Ductile Iron
  • Drive: 460V 3 Phase Electric Motor
  • Seal: Tungsten Carbide
  • Diffuser: Ductile Iron 80-60-03; Maximum Operating Pressure 83 psi (572 kPa)*
  • Semi-Open Type, Six Vane Impeller: Ductile Iron 80-60-03
  • Suction Head: Ductile Iron 120-90-02
  • Motor Housing: Aluminum Alloy 356-T6
  • Intermediate Bracket: Aluminum Alloy 356-T6
  • Strainer Plate: Aluminum Alloy 356-T6
  • Motor Shaft: Stainless Steel 17-4 PH
  • Bearings: Upper and Lower, Open Single Row Ball
  • Discharge Flange: Gray Iron 30
  • Gaskets: Cork w/Nitrile Binder (NC710) and Vegetable Fiber
  • O-Ring: Synthetic Rubber (DuPont Neoprene or Equivalent)
  • Wetted Hardware: Standard Plated Steel and Stainless Steel
  • Strainer: Urethane Coated Steel; 48% Open Area, 0.62 in. (15,7 mm) Square Openings
  • Hoisting Bail: Urethane Coated Steel
Standard Equipment:
  • NEMA Type 3R Rainproof Control Box: Provides On-Off, Circuit Breaker and Motor Overload Protection
Optional Equipment:
  • Liquid Level Control
    • Turtle Type Pressure Activated Level Switch
    • Float Activated Level Switch
  • Staging Adapter Kit
Motor Cable Specifications:
  • Motor: Oil Filled Enclosure; 25 H.P.; 1750 R.P.M.;
    • Three Phase: 460/575 Volt, 60 Hz, 32/26 Full Load Amps, 21 kW (Max.)
  • Power Cable: 6 Wire; Type GGC; 6 AWG. 3 Power Conductors, plus 2 Ground Conductors and 1 Ground Check. Nominal Length 50 Feet (15 m) Standard (Specify Alternate Length at Time of Order.)
  • Recommended Generator Size: 40 kW Across the Line Start, 25 kW for Reduced Voltage Starting
Seal Specifications
  • Tandem, Oil Lubricated
    • Upper Seal: Type 2, Mechanical - Carbon Rotating Face - Ceramic Stationary Face - Nitrile Rubber Elastomers - Stainless Steel 18-8 Cage and Spring
    • Lower Seal: Type 2, Mechanical - Tungsten Titanium Carbide Rotating and Stationary Faces - Stainless Steel 316 Stationary Seat - Fluorocarbon Elastomers (DuPont Viton or Equivalent) - Stainless Steel 18-8 Cage and Spring
  • Maximum Temperature of Liquid Pumped,122 F (50 C)*

*Consult Factory for Applications Exceeding Maximum Pressure and/or Temperature Indicated