Set the garbage disposal down where you can work on and see the rubber gasket. Peel off the old gasket and put the new gasket in the same place making sure that it pops into the lip and sits flat. Now you are ready to set the garbage disposer back in place. Use your knee or a helper to lift the disposal into place while looking down at it from above the sink to verify that the gasket sits flat before locking it back into place. Then look underneath the sink to make sure that all three mounting grooves are locked in. Reconnect the drains and plug the cord back in to test it for leaks.
Energy usage is not high; typically 500–1,500 W of power is used, comparable to an electric iron, but only for a very short time, totaling approximately 3–4 kWh of electricity per household per year. Daily water usage varies, but is typically 1 US gallon (3.8 l) of water per person per day, comparable to an additional toilet flush. One survey of these food processing units found a slight increase in household water use.
Another common cause for a leaking garbage disposal is the disposal flange. A leak at the very most upper area of the garbage disposal could be the garbage disposal flange which goes through the sink. A garbage disposal flange should be sealed with Plumber’s putty and then tightened from underneath the sink. If this is not tight enough or if it has managed to come loose (which can happen) then the garbage disposal will have to be taken down so the flange can be resealed and then the garbage disposal can be rehung.