Tools and Materials Needed:
- Screwdrivers (flat-head and Phillips or a multi-bit)
- Open-end wrench, pipe wrench, channel-locks, or adjustable pliers
- Small bucket or pan to catch water, and clean up rags
- Tape measure and pencil
- Pipe cutter or hacksaw
- Plumber's putty
- A light source to see by
- Either a new garbage disposal or new drain pipes with sink strainer/flange (drain pipe kit)
Additional tools, such as a hacksaw or tubing cutter may be needed. Pipe adhesive may also be needed. It is normally much easier to replace all the piping rather than trying to salvage any of them. However, if only replacing the disposal unit, it may be possible to reuse the existing lines if you are careful.
1. Turn off the disposal's power supply at the circuit breaker and on/off switch.
2. Place bucket (pan) under the p-trap, loosen nuts holding the p-trap on, and remove p-trap.
3. Disconnect dishwasher waste line from supply line, if there is one.
4. Disconnect horizontal disposal discharge line from supply line, loosen the bolt or screws holding the pipe leading into the disposal's discharge outlet, and remove the pipe.
5. Rotate the unit counterclockwise until it comes loose from the mounting assembly. (Using the special tool or a screwdriver may help)
6. Disconnect copper ground wire (may be a green wire), and take cover plate off the base of the disposal. Pull out the wiring, and disconnect all of them by taking off the wire nuts.
7. Use a screwdriver and remove screws and snap ring from mounting assembly, then remove rest of mounting assembly. However, if the new disposal is the same model as the old one, the mounting assembly may not have to be replaced.
8. Either install a new garbage disposal and replace necessary drain lines, or install all new pipes and connections, following the manufacturer's directions.