Garbage Disposal Replacement

Purpose

Procedures for garbage disposal replacement.

When to Use

• Disposal motor has failed, body is corroded through, or customer wants an upgrade

Procedure

Shut off power — turn off breaker or unplug unit

Disconnect dishwasher drain hose if connected

Disconnect discharge pipe

Rotate the disposal to unlock from the mounting ring

If replacing with same brand, the existing mounting ring may be reusable

If new brand or new installation, install new mounting assembly with plumber's putty under the flange

Connect the new disposal to the mounting ring

Connect discharge pipe and dishwasher drain (if applicable)

Knock out the dishwasher plug inside the disposal if connecting a dishwasher

Restore power and test operation

Run water and check all connections for leaks

Test with small ice cubes to verify impeller operation

Important Notes

• Always confirm power is off at the breaker before working on a disposal
• Match the disposal to the sink configuration — check drain opening size
• Disposal replacement is a quick job with good margin — keep common models stocked
• 1/3 HP is minimum, 3/4 HP is recommended for most households
• Dispose of old unit properly — take to truck for recycling

Related SOPs

• Garbage Disposal Troubleshooting — diagnosis before replacement
• Kitchen Plumbing Installation — full kitchen plumbing work