Last, but not least, as your garbage disposal system begins to age, it grows susceptible to cracking along its interior lining. When this shell develops cracks, water will begin to appear at its seams. At times, the leak can be observed from the bottom of the unit, particularly from the reset button. If this is the cause of your garbage disposal’s leaks, then there is no method of repairing other than replacing the whole unit.
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

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