Little Giant 506065 Drainosaur Jr Sump Pump Basin System
- 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.
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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ASIN: B0018LB522Category: Sump Pumps
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.
Pros and cons
- 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 |
|---|---|
| Dimensions & fit | |
| Maximum Lifting Height | 18 feetlower than 68% of 20 sump pumps |
| Item Weight | 13.45 pounds |
| Item Dimensions L X W X H | 13.9 × 13.9 × 10.6 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, Polypropylene (PP) |
| Color | Black/Blue |
| Included components | |
| Unit Count | 1 |
| Number Of Packs | 1 |
| Included Components | Product Only |
| Warranty & support | |
| Manufacturer Warranty Description | 3 year manufacturer |
| Other details | |
| Number Of Items | 1 |
| Product Style | 3.5-Gallon, 1/3 HP |
| Item Type Name | Pumps |
| Specific Uses For Product | Amateur, Professional |
| Item Highlight | 10' Cord, Compact 3.5-gallon Tank, Drainosaur Jr., Automatic Diaphragm Switch, For Laundry / Utility / Wet Bar Sinks, 506065 |
Closest rivals on specs
Zoeller N53 Mighty-Mate Non-Automatic Sump Pump- Horsepower 0.33 vs 0.3 hp (+10%)
Zoeller M63 Submersible Sump Pump 3/10 HP- Horsepower 0.33 vs 0.3 hp (+10%)
- Item Weight 13.45 vs 10 pounds (+34%)
Frequently asked questions
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.