Little Giant WE20G05P4-21 115 Volt, 1/2 HP, 1560 GPH High Head Filtered Effluent/Aeration/Commercial Fountain Pump, Steel,

(10 customer reviews)


Brand Little Giant
Color Steel
Material Stainless Steel
Style 115 Volts, 26 GPM
Item Dimensions LxWxH 22.1 x 3.75 x 3.75 inches
Power Source Corded Electric
Maximum Flow Rate 26 Gallons Per Minute

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The Little Giant WE20G05P4-21 26 GPM high head submersible pump is ideal for filter effluent, filtered effluent service, aeration for 1/2 acre ponds and commercial fountains. This pump features a 1/2 HP Franklin Electric submersible motor and is CSA listed in the USA and Canada.

From the brand

From the manufacturer

Little Giant logo 300x300

Little Giant by Franklin Electric

There’s a reason we’ve been the go-to pump for HVAC, Plumbing, Pool, Water Garden and Hydroponics professionals for generations: experience. For 80 years, Little Giant products have stood the test of time, pumping a steady flow of proven reliability and superior technical know-how.

Little Giant is recognized worldwide for its quality and reliable products.

WE Series 300x300

Little Giant WE20G05P4-21 115-Volt 1/2 HP 20 GPM High Pressure Submersible Pump and Motor

For Septic Systems, Aeration Systems, and Large Fountains

The Little Giant WE20G05P4-21 115-Volt, 1/2 HP High Pressure Submersible Pump is for use in dual chamber high pressure septic systems that separates the solids from the effluent. This pump can also be used in aeration systems in large ponds up to 1/2 acre or large fountains that handle up to 1500 gallons.

The hex rubber bearing has an extra-large surface for shaft stability and multiple flow channels for keeping particles away from bearing surfaces.

At a Glance:

  • 115-Volt, 1/2 HP, 20 GPM high head pump/motor
  • Franklin Electric submersible motor
  • Heavy-duty, 300V, 10-ft. (3m) SJOW motor stripped leads
  • Removable built-in check valve
  • Non-corrosive thermoplastic discharge and motor brackets
  • Proven “PPO” staging allows close tolerances and increased performance
  • High quality top bearing for maximum durability and years of reliable service
  • Stainless steel up thrust washer prevents excessive wear in service applications

Little Giant WE20G05P4-21 115-Volt, 1/2 HP Submersible Pump and Motor

WE Series with Septic System 300x300

WE Series with aerator 300x300

WE Series with fountain 300x300

For dual chamber high pressure septic systems

The Little Giant WE20G05P4-21 1/2 HP, 115-Volt, 60 Hz pump and motor was designed to work in high pressure septic systems where solid waste is separated from the effluent.

This pump will deliver 26 GPM at 50-ft. lift, 20 GPM at 100-ft. lift, and 8 GPM at 150-ft. lift. See specification sheet for performance curve and further details.

The pump is to be hard wired into a power source. Installation by an experienced electrician is highly recommended.

For 1/2 acre pond aeration systems

The Little Giant WE20G05P4-21 is suitable for 1/2 acre pond aeration systems.

Due to the potential danger to people and wildlife, Installation by a professional electrician experienced with pond installations is highly recommended.

For large fountains

The Little Giant WE20G05P4-21 is suitable for large fountains that hold up to 1500 gallons of water.

Due to the potential danger to people and wildlife, Installation by a professional electrician experienced with pond installations is highly recommended.

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Visit the LITTLE GIANT STORE (see link at the top of the page) and shop for similar pumps or accessories under the WASTEWATER or WATER GARDEN categories.

Additional information

Weight 21.76 kg
Dimensions 22.1 × 3.75 × 3.75 cm
Product Dimensions

22.1 x 3.75 x 3.75 inches; 21.76 Pounds

Item model number


Date First Available

April 16 2009




Franklin Electric Co. Inc.

10 reviews for Little Giant WE20G05P4-21 115 Volt, 1/2 HP, 1560 GPH High Head Filtered Effluent/Aeration/Commercial Fountain Pump, Steel,

  1. Dan from Texas

    Been working for years without any problemsI put this in my last septic tank before it goes out to the drainfeild. Installed a push/ pull valve about 3 foot away from the tank (that I keep closed), and a TEE after that. Then piped the discharge from the pump to the TEE. Installed a float that turns the pump on (through a custom control panel I built), when the tank reaches a certain level and shuts it off after it drops a few feet. It’s been working for years now and I have to say that it’s been a godsend because when our clay soil gets saturated with rain, our septic system wouldn’t work but not anymore since installing this pump. I highly recommend it.

  2. jason hilling

    Works just fineAfter the plumber quoted me $1500 for a new one and install I looked on Amazon and found this one. Very easy to install, but use rubber gloves if it is in the septic system and save yourself a grand +. The little giant I replaced was 15 years old so I hope I get the same out of this one.

  3. dp

    Worth the money and peace of mind.This pump replaced my original septic pump after going out within 3 years. That was 6 years ago and the little giant is still working great. I purchased another one after I though it started having issues. Turned out to be a float problem, but since they don’t last forever and if it goes out, it will probably be on a holiday weekend or something like that.

  4. HPKIV

    Correct itemQuick delivery and as described.

  5. Daniel Scheve

    Lasted 2 months… Do not recommendLike the title says… Installed it in April and today June 18th it stopped working. Avoid

  6. Brian J

    Nicely MadeHad no problem installing and was a perfect match to what I previously had in my septic system. Works well for last few months.

  7. James S.

    I really like this pumpPump comes pre-wired with enough wire to easily reach control panel. High pressure is enough to operate four sprinklers

  8. Diana Perez

    Worth itWorks great & easy install

  9. Sunny

    Four StarsProduct was a great replacement of my existing sewer pump and works great.

  10. PhatMatt

    Didnt last a yearPurchased this in March 2020, the motor is already out. There was debris on the screen which was cleaned but the motor just buzzes and the gear just sputters, trips the breaker.

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