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Centrifugal Effluent Pumps

Sump and Effluent Pumps // Effluent Pumps // Centrifugal Effluent Series

Centrifugal Effluent Pumps

Effluent or dewatering submersible pumps for septic tank, low pressure pipe (LPP) and enhanced flow STEP systems.

Features and Benefits

The Zoeller Pump Models 51 and 142 are versatile workhorses for effluent applications. The low flow design of the pump was engineered originally for STEP applications in which the pump, protected from septic solids by a filtered vault, moves effluent directly out of the septic tank without the need for an additional pump tank. Higher flow pumps in that environment cause agitation within the septic tank, disrupt the sludge and scum formations, and lead to maintenance headaches. The model 51 produces a maximum flow of 18 gpm at 5’ of TDH and can reach 21’ at shutoff. The model 142 produces a maximum flow of 18 gpm at 5’ of TDH and can reach an impressive 62 feet at shutoff! The pumps have a powder coated, cast iron housing and are capable of passing 1/2” spherical solids.

  • Model 51 is .3 hp, 9.5 FLA
  • Model 142 is 1 hp, 13.0 FLA
  • Non-automatic (N) and automatic (BN) models available
  • 1-1/2” NPT discharge
  • Passes 1/2” spherical solids


All Zoeller Pump products must be installed and maintained in accordance with all applicable codes.

Product Specifications

Motor 0.3 or 1 HP
Voltage 115 V
Phase 1 Ph
Hertz 60 Hz
Amps 9.5 A (51), 13.0 A (142)
Cord Length 15' (51) or 20' (142)
Cord Type UL listed, 3-wire cord and plug


Part Number Description
51-0002 115V/1Ph Non-Automatic 51 Centrifugal Effluent Pump
51-0006 115V/1Ph Automatic 51 Centrifugal Effluent Pump
142-0002 115V/1Ph Non-Automatic 142 Centrifugal Effluent Pump
142-0006 115V/1Ph Automatic 142 Centrifugal Effluent Pump

Technical Support Literature