Garbage disposal causes sink to back up into the other basin

Safety First: Turn OFF and unplug the disposal. Place a bucket under the sink trap.

• Step 1 – Disassemble drain: Remove the P-trap and cross-over pipe between sink basins. Clear any food or grease buildup.
• Step 2 – Inspect wall stub-out: Use a small drain snake to clear the pipe entering the wall if obstructed.
• Step 3 – Reassemble with new gaskets: Replace worn slip-joint washers and reassemble the piping, ensuring proper slope.
• Step 4 – Test both basins: Run water in both sinks and operate the Tweeny disposal to confirm proper drainage.