Article: If you are installing a garbage disposal of the same brand then you could keep the mounting bracket on the sink drain rather than removing it. The rubber seal will usually come with your new disposal. You can simply wrap it around the flange and then put the drain flange in the drain hole. You will need to use putty if your disposal does not include a rubber seal. Turn the disposal upside down and shake it to remove anything inside. Remove the electrical plate and pull the wires away from the disposal. Screw the strain relief sleeve into place and feed the electrical wires through it into the disposal. If you are connecting the disposal to a dishwasher, then you must remove the knock out plug using a hammer and screwdriver. On many disposals you will connect the ground wire to the green screw on the disposal, and then splice the white wires to white wires and black to black. Secure the connections with wire nuts and tighten the strain relief sleeve. Replace the cover plate on the disposal. You will attach a 90-degree disposal drainpipe to the disposal and the tailpiece to the other sink drain. There should be p-traps on both the disposal and the tailpiece from the other sink and they should be level to one another. Use straight pipes and a T-fitting to connect both drains into one line and route the drainpipes into the main drain.  Dry fit the pieces together at first. Connect the pipes using PVC glue on both the outside of the pipe and inside of the fitting. PVC glue will melt the material a little to give a strong weld. If you are running the drain from a dishwasher through the disposal then you must connect the pipe to the disposal at the spot where you knocked out a plug previously. Turn on the sink and let water run through the pipes for several minutes to make sure nothing is leaking. This can prevent many problems in the future with leaks so make sure you test your pipes.
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Use this method if you have removed your garbage disposal and want to replace it with a newly purchased garbage disposal. Place a rubber seal on the underside of the drain flange. Prepare the new disposal. Connect the electrical wires. Attach the pipes. Connect the dishwasher drain line. Turn on the sink to let water through.