Gray Water Laundry Sump Pump
by Little Giant

This under sink pump system removes water from laundry trays, sinks, etc. (not toilets) where gravity drainage is impractical. Great for basements or areas where the main drain is higher. Designed for above ground. System is UL listed, CSA approved, and the basin is IAPMO approved.

WRSC-6 Compact Drainosaur

Max head
5' 10' 15' 19'
2,750gph 1,750gph 750gph Shut-off
  • Includes 3.5-gallon polypropylene tank
    (only 10-1/2" high)
  • 1-1/2" Fips side intake port tank lid
  • 1-1/2" Fips top discharge port
  • 2" Fips top vent port
  • Easy to remove filter trap
  • Outside basin dimensions: 10.6" high x 14.5" wide
  • Includes 3/10HP automatic submersible sump pump
    #6-CIA-ML pump
    • 8ft, 3-prong, grounded power cord
    • 1-1/2" diameter pipe from pump to lid
  • View dimensions
  • Please see below for the related FAQ about this system's RS-5LL remote switch.
  • 1-1/2" check valve (sold separately below)

#DR-WRSC-6 Compact Drainosaur = $409.58
Water removal systems are not for use with toilets.
View me for sewage ejection systems

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Check Valves For Sump Pumps

Image of PVC swing check valve
Check valves are needed in most sump pump or sewage ejector systems. When installed correctly they will keep the discharge from draining back into the sump after the pump turns off and causing the pump to cycle repeatedly on and off helping to prevent premature pump failure or burn-out.
For your convenience we offer different styles of check valves giving you the freedom to choose the one that will work best for your application. The combination ball and check valves provide a positive manual shut-off allowing you to stop back flow from flowing back to the sump basin while servicing the basin or pump, and inspect and clean the check valve if needed.

Size Description Price & Quantity
1 1/2" PVC Combination Ball and Swing Check Valve - Union x Slip $63.98
1 1/2" PVC Combination Ball and Swing Check Valve - Compression (Comp x Comp) $75.57
1 1/2" PVC Combination Ball and Swing Check Valve - Union x Union $78.42
1 1/2" PVC Swing Check Valve - Slip x Slip - Glue Type $16.78
1 1/2" PVC Swing Check Valve - Compression (Comp x Comp) $33.89
1 1/2" Sump pump swing check valve w/ (2) rubber sleeves and (4) clamps $16.93
1 1/2" Silencer swing check valve w/ (2) rubber couplings and (4) s.s. hose clamps $27.90

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We offer a variety of sump pump check valves - Need a smaller or larger sized PVC check valve?

Gray Water Laundry Pump Related Items

Frequently Asked Questions

Q. "What is gray water?"
A. At its most basic definition, graywater (sometimes noted as greywater, grey water, or gray water) is the used water that goes down your home drains, with the exception of toilet water. This includes wastewater generated by laundry, dishwashing, hand washing, bathing and other washing. While this may be the dictionary definition of graywater, for the purposes of recycling graywater, some plumbing codes define gray water as only water discharged from lavatories, bathtubs, showers, clothes washers, and laundry trays and specifically exclude wastewater from kitchen sinks or dishwashers from their definition of gray water. Once water has been through a toilet, water closet, urinal, or in any way comes in contact with human waste, it is always considered sewage or black water. We recommend confirming with your local code authorities if you are unsure if your application works within code definition of gray water.

Q. "Does this laundry sink pump need to be vented?"
A. Per the manufacturer's installation instructions, this unit does need to be vented and has been designed with a vent connection on the top of the pump to allow for connection to a two-way air venting system. The manufacturer recommends using 1-1/2" PVC or ABS pipe, which is easily available in most localities, but as always, consult with a trusted local professional and your code authorities to confirm your installation meets all code requirements for your area.

Q. "Can I cut off the plug from the end of the Little Giant RS-5LL remote switch that's used on the smaller Drainosaurs so that I can hardwire it into my system?"
A. In a word, no. Not only would that void the manufacturer's warranty, removal of the plug from the RS-5LL switch (which is used on the WRS-5, WRS-6 and WRS-C6 systems) will not allow the switch to function properly (if at all). Pressure from rising water pushes against a diaphragm inside the RS-5LL switch, turning off the switch. For the diaphragm to move, the air above the membrane must be expelled; to allow this air to escape, a small vent tube runs from the top of the switch and along the cord, exiting at the plug. If the plug is removed and the switch is hardwired, the air tube would essentially be "plugged off"; the air from the area above the diaphragm membrane could not vent, which means water pressure would be unable to move the membrane to close the switch.

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