There is no gasket between the flange and the sink. When you raise it up, put plumbers putty under the flange and tighten it back down.: My disposal is leaks when the sink is full of water. I looked under the sink and saw that a gasket between the flange and the sink needs to be replaced. After unscrewing the flange on the underside of the sink I can lift the disposal an inch or two. My question is does the metal ring that is flush on tub side screw on?