E21
Kraus Improper Drain Configuration / Partial Blockage

Kraus garbage disposal backs up into the opposite sink bowl in a double-bowl sink.

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Possible Causes

Clogged cross-over pipe between bowls, Improperly installed baffle tee, Partial blockage in main drain, Insufficient fall in drain piping

How to Fix / Troubleshooting

Safety First: Turn OFF the disposal. Do not use chemical drain cleaners.

  • Step 1 – Plunge opposite bowl: Use a sink plunger on the non-disposal bowl while blocking the disposal side with a stopper. Plunge vigorously to clear minor clogs.
  • Step 2 – Clean cross-over and trap: Remove the cross-over pipe and P-trap under the sink. Clear any food buildup and reinstall.
  • Step 3 – Check baffle tee orientation: Ensure the baffle tee (if used) is installed correctly so that discharge from the disposal flows toward the main drain, not into the other bowl.
  • Step 4 – Test flow: Run water and operate the disposal briefly to confirm that water no longer backs up into the opposite bowl.
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Repair Difficulty

Easy 2/5

Required Part

Sink Drain Kit (Cross-over Pipe, Baffle Tee, P-trap)
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