How to Replace a Garbage Disposal

Garbage disposals are workhorses that inevitably reach the end of their lifespan, usually signaled by persistent leaks or a motor that just refuses to spin. Replacing one is a rite of passage for any homeowner, turning a potentially expensive service call into a straightforward Saturday morning project. The secret to a stress-free swap is patience with the mounting hardware. While the plumbing connections are intuitive, the physical attachment of the unit to the sink drain requires a steady hand and a bit of leverage. When done well, you gain years of quiet, reliable kitchen cleanup without a single drip under the cabinet.

1. Kill Power First. Unplug the disposal from its dedicated outlet under the sink and turn off the circuit breaker for safety. Place a bucket underneath the P-trap to catch residual water, then disconnect the drain pipe and the dishwasher hose attached to the unit.
2. Brace Before You Drop. Support the weight of the disposal with one hand or a stack of books while you unlock the mounting ring. Rotate the ring counter-clockwise until the unit drops free from the sink flange.
3. Scrape and Seal Fresh. Unscrew the old mounting assembly from the sink drain opening and scrape away all old putty. Apply a fresh, thick bead of plumber's putty around the underside of the new flange and press it firmly into the drain hole.
4. Stack and Snap Tight. Slide the fiber gasket, backup flange, and mounting ring onto the new flange from underneath the sink. Secure the assembly using the included snap ring, ensuring it clicks firmly into the flange groove.
5. Lock It Down Clockwise. Lift the disposal and align the three mounting tabs with the tracks on the sink flange. Rotate the unit clockwise until the tabs lock securely into the mounting ring notches.
6. Fill the Sink and Watch. Reconnect the dishwasher hose and the drain tailpiece using the provided rubber gaskets. Run the faucet to check for leaks at every connection before restoring power.