When installing a new dishwasher in your kitchen, you will need to connect the dishwasher to the garbage disposal. The garbage disposal has a port on the side where the dishwasher hose will connect. Before you can connect the hose, you have to remove the plug that blocks the port. Although you can remove the plug while the disposal is in place, you are less likely to damage drain pipes or the flange seal if you disconnect and remove the disposal to knock the plug away from the port. After knocking the plug out, you can then remove the plug from the inside of the garbage disposal.
Unplug the garbage disposal power cord from the outlet underneath the sink. Most garbage disposals have appliance cords just like other appliances. If your garbage disposal is hard wired into the home, turn off the circuit breaker to the disposal.
Remove the cover from the electrical panel on the side of the disposal with a Phillips-head screwdriver if your unit is hard wired to the house electrical system. Pull the wires through the access and disconnect the wire connectors connecting the house wires to the disposal wires. Loosen the clamp that secures the conduit to the side of the disposal and pull the conduit and house wires away from the disposal. Place the plastic wire caps on the house wires.
Loosen the slip nut that connects the drain pipe to the garbage disposal with a pair of channel lock pliers. Once the slip nut is loose, unthread the nut by hand.
Locate the snap ring that locks the disposal to the sink mounting bracket. Pry the snap ring open with a flat-head screwdriver. Twist the garbage disposal and remove the garbage disposal from the sink.
Lay the garbage disposal on its side with the dishwasher port pointing in the air. Just inside the dishwasher port is a plastic wall. This plastic wall is the plug that you will knock out.
Place the end of the flat-head screwdriver on the edge of the plug and the garbage disposal. Tap the screwdriver handle with a hammer to knock the plug loose. Repeat the process going around the circumference of the plug until the plug is free from the unit.
Turn the disposal upside down and shake the disposal until the plug comes out. Set the disposal back into the sink mount and twist the disposal until the disposal locks into place. Press the snap ring together until the snap ring locks over the sink mount.
Thread the slip nut back over the garbage disposal to connect the sink drain pipe to the disposal. Tighten the slip nut with the channel lock pliers.
Insert the conduit back into the disposal and reconnect the house wires to the disposal wires with the plastic wire nuts. Tighten the clamp to secure the conduit to the disposal and place the electrical panel cover back on the disposal. Secure the cover with the retaining screws.
Proceed with your dishwasher installation according to the manufacturer's instructions. Turn the electricity on to the garbage disposal after you finish the dishwasher installation.