Little Giant 506158 Cast Iron Submersible Sump Pump 1/3 HP
- Horsepower: 0.33 hp
- Flow Rate: 46 gpm
- Maximum Lifting Height: 18 feet
- Power Source: Corded Electric
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B000UEV8WAModel: 6-CIACategory: Sump Pumps
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.
Pros and cons
- 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 | 6-CIA |
| Dimensions & fit | |
| Maximum Lifting Height | 18 feetlower than 68% of 20 sump pumps |
| Item Weight | 17 pounds |
| Item Dimensions L X W X H | 9.5 × 8.5 × 6 inches |
| Capacity & performance | |
| Flow Rate | 46 gpmlower than 52% of 24 sump pumps |
| Power & efficiency | |
| Horsepower | 0.33 hp |
| Power Source | Corded Electric |
| Voltage | 115 volts |
| 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 year manufacturer |
| Other details | |
| Number Of Items | 1 |
| Product Style | Cast Iron, 115V, 10' Cord, Integral Diaphragm Switch |
| 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 |
| 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 |
Closest rivals on specs
Zoeller N53 Mighty-Mate Non-Automatic Sump Pump- Horsepower 0.33 vs 0.3 hp (+10%)
Liberty Pumps 257 Submersible Sump Pump- Maximum Lifting Height 18 vs 21 feet (-14%)
Frequently asked questions
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.