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7020, 7021 Grinder Pumps

Grinder Pumps and Systems // Shark® Series

7020, 7021 Grinder Pumps

Progressing cavity grinder pumps

Features and Benefits


  • Sanitary sewage pumping stations
  • Pressure sewage systems
  • Commercial and residential sewage removal



  • Discharge: 1-1/4” NPT horizontal
  • Seals – mechanical carbon/stationary, ceramic/rotary, Buna-N elastomers
  • Construction – motor housing, cover, adapter and pump housing cast iron ASTMA A-48, Class 30, 30,000# tensile strength, corrosion-resistant, powder coated epoxy finish
  • Attaching hardware – 304 stainless steel
  • Square ring and gasket – Viton
  • Stainless steel cutter and plate hardened to Rockwell C 55-60
  • Pressure relief valve
  • Stainless steel legs provide for free-standing installation
  • Stainless steel helix hydraulic rotor
  • Buna-N hydraulic stator


  • Permanent split capacitor (PSC) motor
  • Stator – Class B insulation and lead wires, Nema B design
  • Integral thermal overload protection with automatic reset
  • Housing – Finned cast iron, oil-filled
  • 416 stainless steel motor shaft
  • Upper and lower ball bearings – dual, high carbon chromium steel
  • 20' (6 m) power cord with 15 amp plug (extended cord lengths available)

Note: Product information presented here reflects conditions at time of publication. Consult factory regarding discrepancies or inconsistencies.

Product Specifications

HERTZ                                60 Hz
TYPE                                  Permanent split capacitor
INSULATION                     Class B
DISCHARGE                     1-1/4" NPT
CORD LENGTH                20' (6 m) standard
COOLING                           Oil filled
MOTOR HOUSING            Cast iron
HARDWARE                       304 stainless steel
GASKET                              Viton

Technical Data


To ensure proper pump operation, a swing or flapper style check valve must be installed in the pump discharge line. A faulty or non-functional check valve when combined with a pressure may prevent the pump from starting.

Pump Performance Curves

Design Tools