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How to Replace a Garbage Disposal – Part 3

How to Replace a Garbage Disposal – install the new sink mount, discharge elbow and waste arm plumbing connections.

This project is continued from Part 2.

The new Waste King® Legend 8000 garbage disposer is temporarily mounted to the sink to test fit the plumbing connections. I began by setting the sink flange in the drain hole and spinning on the support ring until it made contact with the bottom of sink. Do not use plumber’s putty or tighten the support ring because this is a temporary installation.

Waste King Garbage Disposal: EZ Mount Sink Flange and Support Ring

Waste King Garbage Disposal: EZ Mount Sink Flange and Support Ring

Install the Waste King EZ Mount

The Waste King EZ Mount Ring and Cushion Mount go on next. Orient the two parts as shown:

Waste King - EZ Mount Ring and Cushion Mount

Waste King – EZ Mount Ring and Cushion Mount

Slip the mount ring over the sink flange, then press the cushion mount over the lip of the sink flange. The cushion mount holds the mount ring in place. The lip of the sink flange fits in the groove of the cushion mount. Inspect the cushion mount fit to ensure it’s even against the flange as shown:

Waste King Garbage Disposal - Mount Ring and Cushion Mount Installed

Waste King Garbage Disposal – Mount Ring and Cushion Mount Installed

Test Fit the Garbage Disposer

The garbage disposer is temporarily mounted to check if adjustments to the plumbing are needed. To mount the Waste King disposer:

  • Lift the disposer up to the mount ring.
  • Line up the hopper projection with groove in the mount ring.
  • Turn the mount ring about 1/2″ so the hopper is projection is in the “supported” position.

The disposal can be rotated by turning the mount ring to make alignments with the plumbing connections. Be careful to turn only the mount ring because if you turn the disposer body you can cause it to fall from the mount.

Waste King Garbage Disposer Plumbing Connections

Waste King Garbage Disposer Plumbing Connections

Connect the Discharge Elbow & Waste Arm

Attach the discharge elbow to the garbage disposer using the metal gasket and two screws. Note that you will need to supply a 1-1/2″ slip nut and washer for the discharge elbow as shown above; these are available in the plumbing section at home improvement stores for a dollar or two.

The 1 HP Waste King Legend 8000 is much larger than my original 1/3 HP disposer, and it was necessary to swing the waste arm forward and extend the telescoping arm to meet the Waste King elbow at an angle as shown above. To do this, I loosen the nuts on the slip joints at the Tee and Arm.

The discharge elbow is clearly too long to fit in the waste arm elbow and will be shortened by sawing off the end. Referring the next photo, mark the cut line as follows:

  • Make sure the waste arm is level – eyeballing it will be close enough.
  • Orient the disposer and waste arm such that the two elbows are side by side.
  • Mark a cut line on the discharge elbow about 1/8″ above the flared pocket of the waste arm elbow.

My cut line is shown here:

Garbage Disposal Discharge Elbow and Waste Arm Plumbing

Garbage Disposal Discharge Elbow and Waste Arm Plumbing

Double check your measurements, then cut the elbow a hack saw or power chop saw. Remove any burrs for a smooth clean end. I removed the disposer to better illustrate the shortened elbow here:

Garbage Disposer Discharge Elbow after Sawing to Fit

Garbage Disposer Discharge Elbow after Sawing to Fit

Reattach the discharge elbow, making sure it’s pointing straight down and tighten the two bolts.

Re-mount the disposal under the sink – remember! this is temporary only – and slip on the nut and washer. Note the slip washer installs with the wide/flat end against the nut and narrow end in the pipe as shown.

Extend the telescoping waste arm and place the discharge elbow inside the waste arm elbow. Tighten the slip nut until snug.

Connect the Garbage Disposer Discharge Elbow to the Waste Arm Plumbing

Connect the Garbage Disposer Discharge Elbow to the Waste Arm Plumbing

Look over your work to check that every fits OK:

Garbage Disposal Plumbing Connection

Garbage Disposal Plumbing Connection

A new electrical outlet is wired for the plug-in power cord in Part 4.

Hope this helps,

Bob Jackson

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One Response to How to Replace a Garbage Disposal – Part 3

  1. Alison Chapple March 5, 2011 at 7:39 am #

    Thanks so much. I have the exact same scenario: a hardwired insinkerator which I’m replacing with the Legend. I was trying to decide how to handle the hardwire to plug and this answered it. Thanks for great directions and pictures!
    Alison
    p.s. I thought the $130 price on Amazon was good, but yours was even better! I don’t know why, but it took about 3 days for them to actually ship, but when they did, it came overnight. Good deal for free shipping.

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