Little Giant 1/3 HP Cast Iron Submersible Sump Pump
- Sump Pump
- Corded electric
- Cast Iron
- 1
A straightforward cast iron workhorse for a standard sump pit, bought for reliability rather than flexible dewatering jobs.
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How it ranks among the 10 sump pumps we track
4.2★ across 587 Amazon ratings, Bayesian-smoothed toward the category average.
587 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
100+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 10 sump pumps we track - how the scorecard works · full sump pumps data report. Confidence: high - strong rating volume and complete data.Updated 7 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Little Giant 506158 is a 1/3 HP cast iron submersible sump pump rated at 2760 gallons per hour at a 5 foot lift, built for automatic residential drainage duty with a factory diaphragm switch.
This is a dedicated sump pump, not an all-purpose dewatering pump. The diaphragm switch turns it on around 7 to 10 inches of water and off around 1 to 4 inches, so it expects a standard sump pit rather than a shallow tray. The epoxy-coated cast iron housing and vortex impeller are built for years of buried, mostly unattended service.
- 2760 GPH at 5 foot lift, 18 foot shut-off head
- 1/3 HP, 115V, 9.0 running amps
- 1.5 inch FNPT discharge, 10 foot cord
- Epoxy-coated cast iron housing
Who it's for
Homeowners replacing a failed sump pump in a basement or crawlspace pit are the main audience. It suits anyone who wants a fixed, non-adjustable float trigger rather than a pump they tune themselves.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cast iron housing outlasts plastic in a wet pit
- Non-clog vortex impeller resists jamming on debris
- Thermally protected motor is CSA listed for US and Canada
- Diaphragm switch is fixed, not adjustable
- Maker states it is not for emergency water removal or general dewatering
Performance notes
The built-in diaphragm switch is pressure activated and fixed, not adjustable, so the on and off points are set at the factory (roughly 7 to 10 inches on, 1 to 4 inches off). The 1/3 HP shaded pole motor is thermally protected and CSA listed, and the non-clog vortex impeller is designed to pass debris that would jam a standard impeller.
Specifications
| Brand | Little Giant |
|---|---|
| Model | 506158 |
| Dimensions & fit | |
| Item Weight | 17 pounds |
| Maximum Lifting Height | 18 feet |
| Item Dimensions L x W x H | 9.5 × 8.5 × 6 inches |
| Capacity & performance | |
| Flow Rate | 46 gpm |
| Power & efficiency | |
| Power Source | Corded electric |
| Voltage | 115 volts |
| Horsepower | 0.33 hp |
| Construction & materials | |
| Material Type | Cast Iron |
| Color | Blue |
| Included components | |
| Unit Count | 1 |
| Included Components | Installation manual, pump with switch attached and 10-ft. cord |
| Warranty & support | |
| Manufacturer Warranty Description | 3 years |
| Other details | |
| Number of Items | 1 |
| Item Type Name | 6-CIA 115 Volt, 1/3 HP, 2760 GPH Cast Iron Automatic Submersible Sump Pump with Integral Diaphragm Switch, 10-Ft. Cord |
| Product Style | Cast Iron, 115V, 10' Cord, Integral Diaphragm Switch |
| Specific Uses For Product | Amateur, Professional |
| Item Highlight | 2760 GPH, Submersible, Epoxy-Coated, Automatic with built-in diaphragm switch, Ideal for residential drainage systems, 506158 |
Other Little Giant sump pumps
How it compares
This product against the closest alternatives we track in sump pumps.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Little Giant 1/3 HP Cast Iron Submersible Sump PumpThis product | 4.2 / 5 | 587 | 4.1 / 5 |
| Superior Pump 91250 1800GPH Thermoplastic Submersible Utility Pump with 10-Foot CordSuperior Pump | 4.6 / 5 | 26,000 | 4.7 / 5 |
| WAYNE CDU800 1/2 HP Submersible Sump PumpWayne | 4.8 / 5 | 1,300 | 4.6 / 5 |
| Zoeller M53 Mighty-mate Submersible Sump PumpZoeller | 4.6 / 5 | 3,200 | 4.3 / 5 |
| SumpJet® Water Powered Backup Emergency Sump PumpLiberty Pumps | 4.6 / 5 | 1,300 | 4.2 / 5 |
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Questions about the Little Giant 506158
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Can the Little Giant 506158 handle a flooded basement floor or standing yard water?
No. The manufacturer specifies it for automatic sump pit duty and states it is not recommended for general dewatering or emergency water removal.
What size discharge pipe does the 506158 use?
It has a 1.5 inch FNPT discharge and ships with a 10 foot power cord.
Is the on/off switch point adjustable on this pump?
No, the built-in diaphragm switch is a fixed, non-adjustable pressure switch that turns on around 7 to 10 inches and off around 1 to 4 inches.