Installing a disposer

Installing Your Replacement Disposer


Note: Important installation safety information is provided in the InSinkErator Disposer ICU manual. Before attempting to install an InSinkErator Disposer, first read and understand the entire safety and installation instructions. To download a free pdf version of the entire ICU manual and safety instructions click here.

If you´re shopping for an InSinkErator® food waste disposer or have just purchased one, you´ll be happy to know that InSinkErator® brand disposers are the easiest to install. That´s because all models feature our stainless steel QuickLock® sink mount. (And if you're replacing an InSinkErator® disposer, installation is even easier.) Just “twist off” the old disposer and “twist on” the new one. What's more, with QuickLock®, you can replace any disposer.

For your convenience, listed below are InSinkErator® installation instructions. Before attempting to install an InSinkErator Disposer, first read and understand the entire safety and installation instructions.



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Turn off the electrical power at the fuse box or circuit breaker.



Using adjustable pliers, disconnect the drain trap from the disposer waste discharge tube.



Support the disposer with one hand and insert the end of wrenchette or screwdriver into the right side of one mounting lug on the lower mounting ring. Lift the disposer slightly and loosen lower mounting ring by pushing or pulling wrenchette or screwdriver to left until disposer is free from mounting assembly.




Lay the disposer on its side and remove the electrical cover plate. Loosen the green ground screw and remove wire connectors. Disconnect disposer wires from electrical supply wires. Loosen screws on the electrical clamp connector and remove wires from disposer.




If your mounting hardware needs replacement, continue to step 3, otherwise skip to step 5.




To remove the existing mounting hardware, loosen the three mounting screws, pry the snap ring off with a screwdriver and remove the old mounting assembly.




Then push the old sink flange up through the sink hole.




Use a screwdriver or putty knife to carefully scrape all old putty from the edge of the sink hole.




Place a 1/2 inch rope of plumber's putty around the drain opening in the sink. Drop the new sink flange into the drain opening and press it into place. Placing a weight, such as your disposer, on top of the sink flange will help hold the sink flange in place while mounting the sink flange to the sink. To avoid scratching your sink or the flange, place a towel between the sink surface and the weight.

From under the sink, slide the fiber gasket and backup ring onto the sleeve. Hold these pieces in place. Next slip on the mounting ring and snap ring.

Tighten the three mounting screws, alternately tightening each screw a few turns at a time until the mounting assembly is evenly and tightly seated against the bottom of the sink.




If using a dishwasher, you will need to tap out the dishwasher knockout plug. Lay the disposer on its side and use a screwdriver and hammer to tap it out. Next, remove the loose knockout plug from inside the disposer.




Lay the disposer on its side under the sink so you can make the electrical connections. Make sure the circuit breaker is off. Remove the plate on the bottom of the disposer to expose the wiring and use wire connectors to connect the wires from the disposer to the matching wires from the power supply. Finally, secure the power cord to the bottom of the disposer using the proper connection. Replace the plate to cover the wires.




Next step, mounting the unit. For Cover Control click here.


All Evolution models install similarly. Hang the disposer by aligning the three mounting tabs with the slide-up ramps on the mounting ring. Holding the disposer in place, turn the lower mounting ring until all three tabs are locked into the mounting assembly. The disposer will now hang by itself.



Insert the discharge tube into the discharge coupler, then slide the clamp over the discharge tube and position it in the groove on the rubber tailpipe coupler.



Rotate the disposer so that the discharge tube is aligned with the drain trap. If the discharge tube is too long, cut off as much of the tube as necessary. If it is too short, you can purchase an extension.



If you are connecting the disposer to a dishwasher, it may be connected through an air gap. Use a hose clamp to attach the drain hose to the dishwasher inlet. Now that everything is installed and in position, lock the disposer to the sink mounting assembly using the special wrench that came with the unit. Insert the Quiet Collar® Sink Baffle into the sink opening by pressing it into the sink until it snaps into place.



For all models, you should test for leaks at the sink flange, dishwasher, tail-pipe and mounting assembly connections. Finally, turn on the electrical breaker to test its operation.




Cover Control Specific Instructions
For the Cover Control model, the sink baffle was put in place at the factory. If it has been removed, it will be much easier to insert it now BEFORE mounting the unit.



Hang the disposer by aligning the three mounting tabs with the slide-up ramps on the mounting ring. Holding the disposer in place, turn the lower mounting ring until all three tabs are locked into the mounting assembly. The disposer will now hang by itself.



Insert the discharge tube into the discharge coupler, then slide the clamp over the discharge tube and position it in the groove on the rubber tailpipe coupler.



Rotate the disposer so that the discharge tube is aligned with the drain trap. If the discharge tube is too long, cut off as much of the tube as necessary. If it is too short, you can purchase an extension. If you are connecting the disposer to a dishwasher, it may be connected through an air gap. Use a hose clamp to attach the drain hose to the dishwasher inlet. Now that everything is installed and in position, lock the disposer to the sink mounting assembly using the special wrench that came with the unit.



Next, lock the Cover Control switch housing into place. It snaps into place on two of the three bolts on the mounting assembly.



For all models, you should test for leaks at the sink flange, dishwasher, tail-pipe and mounting assembly connections. Finally, turn on the electrical breaker to test its operation.




Tools & Materials Needed

  • Slotted Screwdriver
  • Adjustable Pliers
  • Plumber's Putty
  • Electrical tape
  • Wire Connectors (2)
  • Safety Glasses
Optional Tools & Materials
  • Phillips Screwdriver
  • Drain Auger
  • 3/8" Electrical Clamp Connector
  • Second 1 1/2" Drain Trap
  • Hammer
  • Hacksaw
  • Water Hose Clamp
  • Pipe Wrench
  • Copper Ground Wire
  • Dishwasher Drain Connection Kit
  • Air Gap
  • Drain Tube Extension
  • Electrical On/Off Switch or In-Sink-Erator SinkTop Switch(tm)
  • InSinkErator Power Cord Kit

    To download a free pdf version of the entire ICU manual and safety instructions click here