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.
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.
Disposers fasten to the sink drain fittings in a number of ways--some use threaded plastic nuts, others large hose clamps--but the mounting-ring assembly shown here is the most common. To remove the disposer, support it from below and rotate the large, 3-tab mounting ring at the top counterclockwise until the unit falls away. Remove the remainder of the drain assembly by loosening the three bolts and prying off the retaining ring. Push the drain out through the sink hole and clear away any old caulk or putty.
Fixing a leaky sink flange may be very easy. It could be a simple matter of tightening the bolts that hold the flange onto the sink drain. But if that doesn’t work, you may need to apply a new layer of plumbers putty to seal the flange into place. To do this, you’ll need to loosen the mounting bolts and create enough space between the flange and drain to smear a fresh dab of putty all the way around the drain. Then just re-tighten the bolts and wait a few hours for the putty to form a tight seal.
Waste King 9930: 1/2 horsepower garbage disposal with pre-installed power cord and sound insulation. Energy efficient permanent magnet motor and stainless steel swivel impellers reduce jamming. Durable, all-metal mounting assembly. Rust and corrosion-proof glass-filled nylon grind chamber and drain housing with stainless steel grinding components. Continuous feed technology. Front-mounted reset button for easy use. Safe to use with properly-sized septic tanks.