Little Giant 1/3 HP Compact Automatic Sump Pump Basin System
- Sump Pump
A tidy, purpose-built solution for small-appliance drainage, with the caveat that you still need to buy the check valve and discharge pipe separately.
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How it ranks among the 10 sump pumps we track
4.5★ across 380 Amazon ratings, Bayesian-smoothed toward the category average.
380 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: limited - incomplete product information.Updated 8 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Little Giant 506065 is a compact, preassembled sump system pairing a 1/3 HP automatic pump with a 3.5 gallon polypropylene basin, sized for laundry, utility and wet bar sinks rather than a full basement pit.
This self-contained basin and pump combination, sold under the Drainosaur Jr name, is aimed at appliances and fixtures that drain into a small space: high-efficiency washing machines, utility sinks, dehumidifiers, air conditioners and water softeners. It ships with piping, multiple adapters and O-rings, but the maker notes the check valve, discharge pipe and union are not included, so budget for those separately.
- 1/3 HP pump, 2760 GPH at 5 foot lift
- 3.5 gallon polypropylene basin
- Diaphragm switch: on at 4-7 in, off at 1-3 in
- Includes piping, adapters and O-rings
Who it's for
Fits anyone installing a laundry area, wet bar or utility sink below the main drain line who needs a small collection basin plus pump rather than a full-size sump pit setup.
Strengths and trade-offs
Drawn from this product's published specifications.
- Preassembled basin and pump save separate sourcing
- Automatic diaphragm switch needs no manual float adjustment
- Multiple included adapters fit common pipe sizes
- Check valve, discharge pipe and union are sold separately
- 3.5 gallon basin is too small for basement groundwater duty
Performance notes
The integral diaphragm switch activates the pump automatically once water in the basin reaches 4 to 7 inches and shuts it off once the level falls to 1 to 3 inches. Included adapters, two 1-1/2 inch MNPT by 2 inch slip for inlet and discharge and one 2 inch MNPT by 1-1/2 inch slip for vent, are sized to fit common drain and vent pipe, with a removable filter built into the basin cover.
Specifications
| Brand | Little Giant |
|---|
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 Compact Automatic Sump Pump Basin SystemThis product | 4.5 / 5 | 380 | 2.7 / 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 sump pumps
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What does the Little Giant 506065 come with?
It includes the 1/3 HP automatic pump, a 3.5 gallon polypropylene basin, piping, several adapters, and O-rings, all preassembled.
Do I need to buy anything extra to install the 506065?
Yes, the manufacturer notes the check valve, discharge pipe and union are not included and must be purchased separately.
What appliances is this basin system meant for?
The maker lists high-efficiency washing machines, utility sinks, wet bar sinks, dehumidifiers, air conditioners and water softeners.