One of the handiest appliances in your kitchen is probably something that you don’t think about very often, until it stops working. It’s your garbage disposer, and today I’m going to show you how to replace a garbage disposer under your kitchen sink. This project requires some moderate do-it-yourself skills, and it also requires turning off the electricity to the disposer at the electrical panel. But it’s really not that difficult, so let’s get started.
To be prepared, measure the distance from the outlet to the top of each disposal before you remove the old unit. If the new unit’s outlet is lower, you must also lower the tee that the discharge pipe connects to. Loosen the two nuts that connect the tee to the tailpiece above and the trap below. Try lowering the tee to see if the tailpiece is long enough. If it’s not, you’ll have to replace it with one that’s slightly longer.

If the plumber’s putty has failed, you might be able to stop the leak by replacing the putty.  To do so without removing your garbage disposal, loosen the retaining bolts until a gap forms, force the new putty between the pipe and flange, and retighten the bolts to secure the putty into place.  If this does not work, then remove your disposal unit and reseal the flange.  To do this:
A leaky garbage disposal is not only a hassle, it’s also a mess and can also result in other problems if left unfixed. If you’re inexperienced in home improvement work, diagnosing the source of the leak may seem like quite a challenge. Make your life easier with the help of the information below. Once you start eliminating each possible option on your checklist, you should be able to identify the problem quite quickly.
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.

Garbage Disposal