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.
This new one some how makes it quiet when using the disposal. I have no idea how old the other one was, it was here when we moved in. It was flimsy and would let dirty water come up. Cleaning the splash guard and the drain it went into didn't help at all. The new is firm and sits in the drain level. My daughter was putting the old one slanted some to keep it in there. After 2 1/2 years it was falling apart. I wish I'd bought one when we first moved in. This is the first garbage disposal for me but now I've learned what to expect from it. I recommend this product and will buy another if I'm still here when this one starts to get flimsy!
If your garbage disposal is making a clicking or rattling sound, there may be some food particles that will not grind up inside. Remove power from disposer, reach into the sink hole with a pair of tongs and remove anything that is still down in the disposer. Test your disposer to be sure the noise is gone. If not continue troubleshooting your disposer issue (see below).