Steps:
- Use pliers to remove the threaded plug from the underside of the sink trap. (If the trap doesn’t have a drain plug, remove the entire trap.)
- With the plug removed, check to see if water drains freely through the trap. If not, remove the trap and clean it out.
- Disconnect the elbow from the garbage disposer and check for clogs.
- Remove the vertical tailpiece that extends down from the sink drain.
- Check for clogs in the baffled T-fitting that’s attached to the bottom end of the tailpiece.
- Replace the old plastic baffled T-fitting with a full-sized brass T-fitting that has no baffle.
- Tighten all the plumbing connections with pliers.
- Replace the threaded drain plug in the bottom of the sink trap.
- Lay some paper towels across the floor of the sink cabinet.
- Fill the sink with water and then pull the drain.
- Check to be sure the water drains rapidly and that none of the plumbing connections leaks; drips will appear on the paper towels.