Install a Garbage Disposal and Sink Drain Connections

A. Finished-Project Specification

Quantity: one listed disposer mounted to the sink flange assembly, discharging to one approved trap and branch, with the dishwasher connection completed where the project plan specifies a dishwasher tie-in, and the electrical connection completed only by the assigned qualified installer or listed cord-and-plug method.

B. Installation Schedule

Item	Target Condition	Verification Method
Electrical de-energization	Disposer circuit confirmed disconnected before mechanical or wiring work begins	Non-contact voltage tester reading at the disposer connection point
Sink opening condition	Clean, free of cracks, corrosion, distortion, or unsupported material	Visual inspection
Mounting assembly	Flange, gasket, backup ring, and mounting ring assembled per manufacturer sequence, tightened evenly, fully locked	Visual inspection and manual lock-ring check
Discharge and trap	Discharge aligned to an approved trap and branch without S-trap, double trap, or back-pitch	Visual inspection against approved plan
Dishwasher connection	Knockout removed only if required; high loop or air gap installed at controlled height	Visual inspection and measurement
Free-rotation check	Flywheel and rotating components move freely with power disconnected	Manual check with supplied wrench, power confirmed off
Fill-and-drain test	No leakage at flange, discharge, trap, or dishwasher connection under full-basin release	Direct observation during and after test
Operational test	Disposer runs without excessive vibration, abnormal sound, or overheating	Direct observation during brief operation per manufacturer procedure

C. Material Takeoff

• Disposer and mounting hardware: one listed disposer with its specified sink flange, gasket or sealant, backup ring, mounting ring, and fasteners.
• Discharge and trap hardware: discharge tube, gasket, flange, and fasteners, plus trap and branch fittings specified by the approved plan.
• Dishwasher hardware: connection hose, clamp, and high-loop or air-gap fitting specified for the project, where a dishwasher tie-in is included.
• Electrical hardware: listed cord kit or hardwired connection parts, strain relief, and grounding hardware assigned by the electrical specification.
• Documentation: one Disposer Installation Worksheet per project, plus photographs of the mounting assembly, discharge connection, and electrical connection.

D. Acceptance Standards

Check	Standard
Electrical verification	De-energization confirmed by non-contact voltage tester before mechanical or wiring work; power restored only after mechanical work is complete and free rotation is confirmed
Mounting security	Mounting ring fully locked; disposer does not shift or rotate under normal hand pressure
Drainage configuration	Discharge and trap arrangement matches the approved plan; no S-trap, double trap, or back-pitch present
Dishwasher connection	High loop or air gap installed at the controlled height where specified; knockout removed only when required
Leak condition	No leakage at flange, discharge, trap, or dishwasher connection during or after the fill-and-drain test
Operational condition	No excessive vibration, grinding contact, abnormal sound, breaker trip, or overheating during the operational test
Documentation	Disposer Installation Worksheet complete with model, drain arrangement, electrical handoff, and test results

E. Preparation and Electrical Isolation

1. Review disposer instructions, sink compatibility, drain configuration, dishwasher connection, switch or cord requirements, and local restrictions. Confirm the disposer model and required hardware match the approved project plan.
2. Confirm that electrical power is disconnected and verified at the disposer circuit. Use a non-contact voltage tester at the disposer's own connection point; do not rely on a switch position or breaker label alone.
3. Shut off water where necessary and protect the cabinet. Apply the Chapter 1 shutdown and protection sequence to the affected fixture and cabinet.

F. Removal and Sink Preparation

1. Disconnect and remove the existing drain basket, disposer, or branch components included in the project. Control retained water and support the assembly while removing it.
2. Clean the sink opening and inspect for cracks, corrosion, distortion, and unsupported material. Stop work if the sink cannot support the mounting assembly.

G. Sink Flange Mounting

1. Assemble the disposer sink flange, gasket or sealant, backup ring, mounting ring, and fasteners in the specified sequence. Follow the manufacturer's exact assembly order.
2. Tighten the mounting assembly evenly without distorting the sink. Alternate across fasteners rather than fully tightening one side first.

H. Electrical Preparation

1. Remove the dishwasher-inlet knockout only when a dishwasher hose will be connected and retrieve the plug from the disposer. Confirm the plug is fully removed and accounted for.
2. Prepare the disposer electrical connection using the listed cord kit or hardwired method assigned by the electrical specification. Route conductors without strain, kinks, or contact with moving components.
3. Install the strain relief and grounding connection according to the electrical instructions. Confirm the grounding conductor is securely terminated before proceeding.

I. Mounting the Disposer

1. Lift and lock the disposer onto the mounting ring using the required support or helper. Confirm the mounting ring locks fully with an audible or visible engagement per manufacturer instructions.
2. Rotate the disposer to align the discharge outlet without placing stress on the sink flange. Support the unit while rotating; do not let its weight hang on the flange during alignment.

J. Discharge and Dishwasher Connections

1. Install the supplied discharge tube, gasket, flange, and fasteners. Confirm the gasket seats fully before tightening.
2. Connect the discharge to an approved trap and branch arrangement without creating an S-trap, double trap, back-pitch, or cross-connection. Verify the configuration against the approved project plan.
3. Connect the dishwasher hose using the approved high loop or air-gap arrangement. Secure the hose at the controlled height specified by the project plan.

K. Free-Rotation Check and Water Restoration

1. Confirm that all rotating components move freely using the supplied wrench with power disconnected. Do not proceed to restore power if the flywheel binds or will not turn.
2. Restore water and fill the sink to inspect the sink flange. Observe the flange directly while the basin fills.
3. Release water and inspect the discharge, trap, and dishwasher connection. Observe every disturbed joint during the full-basin release.

L. Electrical Restoration and Operational Test

1. Restore electrical power through the approved method. Confirm the connection was completed by the assigned qualified installer where required.
2. Run cold water and operate the disposer briefly according to the manufacturer's procedure. Observe startup, operation, and shutdown.
3. Inspect vibration, sound, mounting security, drainage, electrical cord clearance, and leakage. Confirm every condition against the Acceptance Standards table.
4. Stop work for breaker trips, grinding contact, severe vibration, overheating, or leakage at the sink flange. Treat any of these as a stop-work condition.

M. Correction and Documentation

1. Isolate power and water before correction. Confirm de-energization again with the non-contact voltage tester before touching any disturbed connection.
2. Repeat the operational test and complete a delayed reinspection. Allow the assembly to sit undisturbed, then recheck every connection for leakage or movement.
3. Document disposer model, drain arrangement, electrical handoff, and test result. Complete every field on the Disposer Installation Worksheet.