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Liberty 331 centrifugal pump in cast aluminum housing with brass fittings

Liberty

Liberty 331 Centrifugal Pump 1/2 hp 115 V 8.0 A 105 ft head 40 psi

SKU CH-EBQQ-ETBWQ MPN 331

A 1/2 hp centrifugal pump delivers up to 105 ft head and 40 psi for drainage and transfer tasks

  • TypeDrain Components
  • 1/2 hp motor delivers up to 105 ft head for strong lift
  • Best efficiency at 9 to 13 gpm between 48 and 71 ft head
  • 115 V single-phase operation draws 8.0 A for standard circuits
  • Carbon/ceramic Buna-N seal resists wear up to 135 °F liquid temperature
  • Brass, cast-aluminium and stainless-steel wetted parts suit demanding drainage tasks

Application & Duty

The Liberty 331 is a portable utility pump built for intermittent water transfer and drainage tasks. Its 1/2 hp motor runs on 115 V single-phase power and draws 8.0 A at 60 Hz, delivering up to 105 ft of head and 40 psi. Wetted parts are brass, cast aluminium, stainless steel and thermoplastic with a carbon/ceramic Buna N seal rated for liquid temperatures up to 135 Degrees F.

Suitability Limits

This unit suits homeowners or contractors needing a self-contained pump for clean-water boosting, tank transfer or shallow suction lift up to 15 ft. It is not for continuous high-volume dewatering, solids handling, salt-water exposure or installations requiring greater suction lift than 15 ft. The NEMA Type 3 enclosure is not rated for submersion.

Efficiency Window

Best efficiency occurs between 9 and 13 gpm at heads of 48 to 71 ft, with a maximum head of 105 ft and pressure of 40 psi. Operation outside this range reduces flow and increases motor load, so match the system curve to this window for reliable performance.

Highlights

  • 1/2 hp motor delivers up to 105 ft head for strong lift
  • Best efficiency at 9 to 13 gpm between 48 and 71 ft head
  • 115 V single-phase operation draws 8.0 A for standard circuits
  • Carbon/ceramic Buna-N seal resists wear up to 135 °F liquid temperature
  • Brass, cast-aluminium and stainless-steel wetted parts suit demanding drainage tasks

Specifications

TypeDrain Components
BrandLiberty
Model331

Questions about this item

What does the 115 V 8.0 A rating mean for circuit planning?

The pump draws 8.0 amps at 115 volts single-phase, so size the branch circuit and breaker accordingly.

What inlet and outlet fittings does the Liberty 331 need?

It has 3/4 inch GHT threads on both inlet and outlet; use matching garden-hose-thread adapters or hose barbs.

How do I prime the Liberty 331 and what mistake should I avoid?

Fill the casing completely with water before starting; the common error is running it dry, which damages the carbon/ceramic seal.

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