Check out the Zoeller YouTube Channel for tips, training, and product videos!


7020, 7021 Grinder Pumps

7020, 7021 Grinder Pumps

Application- Commercial Buildings

Progressing cavity grinder pumps


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



  • Discharge: 1-1/4” NPT horizontal
  • Seals – Silicon Carbide/Carbon, Buna-N elastomers
  • Construction – motor housing, cover, adapter and pump housing cast iron ASTMA A-48, 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.

Voltage Ability 230 or 200 (2 HP Only)
Phase 1
Hz 60
Discharge Size 1.25″
Solids Handling Grinder, Slurry
HP 1 & 2
RPM 1750
Seals Silicon Carbide/Carbon
O Rings Viton
Impeller Hydraulic Rotor


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