Installing a Disposer

Installing Your Disposer For The First Time

 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.

To view a multimedia demonstration of this tutorial, click here.
The demonstration requires Macromedia Flash 4 player. If you don't already
have it, click here to get it.

Disconnect the p-trap and the horizontal extension pipe. Large channel-lock pliers or a pipe wrench work well to loosen the nuts holding the pipes together. When both connections are free, remove the parts. You may want to clean the horizontal drain pipe to eliminate any possible blockage. (This is not necessary in new construction.)

Remove the strainer body from the sink by unscrewing the large nut that holds it in place underneath the sink. Push the strainer body up through the sink hole to remove it. Clean off the old plumbers putty that surrounds the edge of the drain opening.

Separate the parts of the mounting assemble from the disposer. Loosen the screws of the mounting assemble and remove the snap ring. Place a 1/4" bead 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. 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. Alternate 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. Remember to remove the knockout plug from inside the disposer.

Danger Potential Electrical Shock- Turn off electrical power at fuse box or circuit breaker before removing electrical cover plate. Disposer must be grounded. Improper connection could result in electric shock. If you are unsure your electrical connection is grounded properly contact a certified electrical contractor.

Lay the disposer on its side under the sink so you can make the electrical connections. (Check your local codes, they may require a licensed electrician to make the electrical connections.) Make sure the circuit breaker is off. Remove the plate on the bottom of the disposer to expose the wiring. Using wire nuts, connect the white wire from the disposer unit with the white wire from the power supply. Follow the same step to connect the black wires. Finally, connect the ground wire from the supply to the ground on the disposer unit. Replace the plate to cover the wires.

Align the disposer with the three mounting ears on the sink mounting assembly. Holding the disposer in place, turn the lower mounting ring until all three mounting ears are locked into the mounting assembly.

Warning Personal Injury- Do not position your head or body under disposer; unit could fall during removal or installation.

Install the discharge tube to the disposer. Turn the disposer until the discharge tube aligns with the drain trap. If it is not long enough, you need to purchase extension pieces to make up the difference. [For more information refer to the Disposer ICU manual by clicking here]

Connect the dishwasher tube to the disposer. Make sure Step 5 is complete.

Now that everything is installed and in position, lock the disposer to the sink mounting assembly using the Jam Buster™ wrench that came with the unit. Finally, you should test the disposer for leaks and turn on the electrical breaker to test its operation.

Materials Needed
  • Copper wire
  • Plumber's putty (.1 kg)
  • Wire nuts (2-Size 54)
  • Worm gear clamp
  • Dishwasher drain connector kit - optional
  • On-off electrical switch
Tools Needed
  • Hammer
  • Channel-Locks
  • Flathead screwdriver
  • Phillips screwdriver
  • Pipe wrench

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