Unscrew the Pivot Nut - How to Unclog a Drain in 6 Steps - Bob Vila
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Unscrew the Pivot Nut
Before you can unclog the drain, you need to remove the stopper. To do that, look in the cabinet under the sink for something that looks like this. Unscrew the pivot nut connected to the drain pipe (the thing in the photo that is connected to the metal strip with holes) and pull the rod out of the pop-up assembly (be careful not to lose any parts).