If the unit is hardwired to the house then you have to use a screwdriver to remove the plate covering the wire connections on the disposal. Disconnect the exposed wires and then remove the plate covering the junction box on the wall. Untwist the wire caps securing the disposal wires to your home wires and set the disposal’s wires on the side. Twist the wire capes over the exposed wires in the junction box, put the wires into the junction box and reattach the junction box plate.
The metal sink flange that sits directly inside the sink drain is typically sealed around the top with plumber’s putty (a clay-like sealant) and then secured from under the sink with bolts. If the plumber’s putty deteriorates, or the bolts loosen, the flange can no longer form a watertight seal between the sink drain and the disposal—which could cause a leak at the top of the unit.
Cecilia Harsch has been writing professionally since 2009. She writes mainly home improvement, health and travel articles for various online publications. She has several years of experience in the home-improvement industry, focusing on gardening, and a background in group exercise instruction. Harsch received her Certified Nurses Assistant license in 2004. She attended Tarrant County College and studied English composition.