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Internet #204264943

Model #506065

WRSC-6 Compact Drainosaur 0.3 HP Water Removal Pump System

  • Polypropylene tank construction ensures durability
  • 3.5 gal. capacity for holding gravity-drained water from sinks
  • Pre-assembled design enables convenient installation
  • See More Details

Frequently Bought Together


Product Overview

WRS Series, a convenient sized tank and pump combo, is ideal for impractical gravity drainage areas such as under sinks and laundry trays. The compact Drainosaur removes water from laundry trays, lavatory sinks, wet bar sinks, dehumidifiers, air conditioners (condensate), water softeners, etc. Installs above floor, no need to dig a sump. Unit is pre-assembled and ready-to-install.
  • 3.5 Gal. tank size
  • Includes two 1-1/2 in. MNPT x 2 in. slip adapters for inlet and discharge
  • Includes one 2 in. MNPT x 1-1/2 in. slip adapter for vent
  • Cylindrical polypropylene tank
  • Easy to remove filter trap available
  • cCSAus listing (pump only)
  • IAPMO approved basins
  • Automatic operation with integral diaphragm switch: On level: 7 in. - 10 in.; Off level: 1 in. - 4 in.; (Integral diaphragm switch is non-adjustable)
  • Click here for more information on Electronic Recycling Programs
  • California residents

Info & Guides

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WRSC-6 Compact Drainosaur 0.3 HP Water Removal Pump System
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BrandLittle GiantLittle GiantLittle GiantLiberty Pumps
Name6-CIA 1/3 HP Submersible Discharge PumpWRSC-6 Compact Drainosaur 0.3 HP Water Removal Pump SystemWRS-6 Drainosaur 0.3 HP Water Removal Pump SystemCSP-Series 1/3 HP Submersible Crawl Space Sump Pump Kit
Housing MaterialAluminumCast-IronCast-IronAluminum
Discharge Flow @ 0 ft. (gallons/hour)2760270027002700
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Product Depth (in.)
Product Height (in.)
Product Width (in.)
Switch-Off Height (in.)
Switch-On Height (in.)


Amperage (amps)
Cord Length (ft.)
Discharge Flow @ 0 ft. (gallons/hour)
Discharge Flow @ 0 ft. (gallons/min)
Discharge Flow @ 10 ft. (gallons/hour)
Discharge Flow @ 10 ft. (gallons/min)
Discharge Flow @ 15 ft. (gallons/min)
Housing Material
Impeller Material
Maximum Horsepower (hp)
Maximum Horsepower (hp)
Maximum Pressure (psi)
Maximum Working Temperature (F)
Minimum Sump Basin Diameter
14 1/2 to 17 7/8
Minimum working temperature (F)
Outlet Diameter Connection (in.)
1-1/2 FPT
Pack Size
Power Type Required
Product Weight (lb.)
Pump Switch Type
Vertical Lift (ft.)

Warranty / Certifications

Certifications and Listings
CSA Listed
Manufacturer Warranty
Limited Warranty

Questions & Answers


How well will this handle grit from soaps? Talking pumice and or walnut, looking at installing in...

Asked by Soupy January 29, 2021

I would probably opt for the Liberty 405, Home Depot SKU 304498827 because it will handle larger solids. Not because of the aggregate in the soap but because of the walnut shells. They could clog the intake screen on this one; the Drainosour. As to the soap, it does not pose a problem when the pump runs but when it is off. That is when it will coat the impeller. When the pump runs the impeller is not really touching the fluid. I know that sounds very counter intuitive but allow me to explain. When the impeller in a sump, effluent or sewage pump begins to spin it creates a negative pressure. The fluid boils because of this negative pressure. This is called cavitation. So the impeller is in an air pocket. Fluid is drawn to this negative pressure. This pushes the water in front of it ahead and that is how the pump works. The impeller is not acting like a water wheel as most people think it does. Instead it is creating the negative pressure and most of the fluid is bypassing it. I have taken many old pumps apart and you see no dings in the impeller because it has not come in contact with the solids. The solids are only in direct contact when the pump is off.

Can it pump over a 10’ interior wall?

Asked by Rob July 28, 2020

Pump performance is pretty much always expressed on a graph called a pump curve. On one axis is height and on the other axis is flow. The curve or graph illustrates pump performance at all these points. If you look under the header "Info and guides" on the Home Depot product listing page you will find a PDF of the specification sheet. if you open that document you will find the pump curve on the second page. If you look at 10' you will find that this pump will move 30 gallons per minute. What I can;t tell you is if that will meet your needs as I do not know what your needs are. Also I do not know if that is the total height you need. However i can tell you that as a best practice you want to select a pump where you application is at the center of the curve,. Meaning you don;t want to oversize or under size. That appears to be the case here.

I need to replace the rectangular cover with four corner screws for this unit. It became brittle ...

Asked by Jim July 7, 2020

We can try. If you look in the spec sheet you will see that the part number is 113132. If you would like to call us with your Home Depot order number we can pull you up in our system and have Little Giant send you one. Unfortunately with out that they will require payment for the part and shipping. If you don;t have that available but did buy it from the Home Depot you can call them and they can pull it up for you in there system and give it to you. Thanks Chris

108082 part ? Do u have pic of part, cost, shipping if applies

Asked by 7425 November 29, 2019

Please open the Use and Care manual, a PDF of which can be found under the header “listing and guides” on the Home Depot product listing page. There you will see an illustration of the parts breakdown. I am sorry but I do not work for the Home Depot so I cannot tell you definitively what they would charge. However I can’t image it would be significant.

i need a intake screen replacement part for this pump 506065

Asked by 7425 November 26, 2019

The part number of what you are looking for is a 108082. If you give us a call with your Home Depot order number, I will be able to bring your order up in the system and have one sent to you. Chris 978 651 3301

does the vent need to be piped to the outside

Asked by David November 13, 2019

Of course local code may require it but it is not necessary for the pump to function properly. I would recommend the use of an Oatey sure vent to help control sewer gasses

is the unit fully assembled? or, does the pump need to be installed into the container and then secure the lid to it?

Asked by Scott July 6, 2019

It was delivered fully assembled.

Can Install this inside a sump pit?

Asked by mike September 16, 2018

This pump is designed to sit on a hard level surface and that could be in a sump pit. But this pump isn’t a sump pump and takes water into the pump through a plumbed threaded inlet in the top of the outer housing. It would not pick,water up from the bottom of the pit like a true sump pump would. If the sump pit never takes water and is dry all the time you could use the space in the pit for this pump. This pump is sized to directly fit under a typical utility sink and that is where I mounted mine. Hope that helps.

can you hook up multiple sinks and a washing machine to this pump

Asked by Bdmiller12 May 2, 2018

Yes. It depends on the discharge volume of water that the pump should handle. My washing machine discharge the water into the basin/sink and from the sink the hose connected to the pump that discharge the water into storm/sanitary system. It works fine and I had a great experience.

Please verify the gph specs for this pump. It seems it should pump more water with a .3 hp motor (drawing 9 amps). Thanks.

Asked by Mfa November 14, 2017

I am not completely sure what GPM figure you are questioning but I can say that the pump curve on the specification sheet, ( a PDF of which is on the Home Depot product listing page under "Info and Guides" ) is accurate. The curve indicates that this pump will have a flow rate of 45 GPM at 0-5", 20 GPM at 12.5' and will dead head, meaning flow rate will drop to zero at 16'. In my experience shape of the impeller as well as the volute will have a greater influence on the pump curve than the HP rating of the motor that drives it. For example many grinder pumps will have a curve showing much less of a curve than you would expect but they will rip a towel apart if it gets flushed. However most of the time they will not draw that much current. The current draw will drop off after the unit starts.

WRSC-6 Compact Drainosaur 0.3 HP Water Removal Pump System - page 2

Customer Reviews

  • 4.2
    out of 23 reviews
  • 75% recommend this product
Filter by:
Showing 1-10 of 23 reviews
I was forced to replace this very same unit after 15 years because it got very noisy and would n...
I was forced to replace this very same unit after 15 years because it got very noisy and would not turn off. I bought a exact replacement and in the matter of an hour had the new one up and running. Very happy with the product.
by Mike
2 people found this helpful
The pump looked well made as well as the outer...
The pump looked well made as well as the outer casing, but the plastic holding structure, discharge pipe and gosh awful cheap filter cage was smashed to bits in the process of shipping to the home. I have discount kids toys that are better made. I thought about trying to fix it, but just returned it to the store. One would think that using heavy steel pump would signify a better all round product. Definitely was not Plug and Play...
by RAG
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Performed perfectly.
Performed perfectly.
by Pinky
Nearly an exact replacement for an older model. ...
Nearly an exact replacement for an older model. The fittings aligned well which simplified installation.
by DC
This was a replacement item for me. The old one was at least 8 years old. The old one still pumpe...
This was a replacement item for me. The old one was at least 8 years old. The old one still pumped water but would not turn off on it's own so I had to remember when doing laundry to manually plug it in (so the utility tub wouldn't overflow) and then unplug it (so not to burn out the pump). The constant up and down the stairs was all good exercise and I have had some extra time at home these last few months thanks to Covid, but it sure is nice to have the luxury of a new pump with a working switch! Be sure to clean the screen regularly!
by Lisa
1 person found this helpful
Easy to install, no problems
Easy to install, no problems
by TheHook
Diaphragm switch is too sensitive causing pump to cycle many...
Diaphragm switch is too sensitive causing pump to cycle many times. This pump is also noisier than the pump it was replacing.
by ROY
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Showing 1-10 of 23 reviews