Step 3 · Remove the Old Drain Flange
With the stopper removed, you will see the metal cross-pieces inside the drain. Insert the drain wrench (also known as a dumbbell wrench) so it firmly engages these cross-pieces. Fit the handle of a large adjustable wrench or a large screwdriver through the top of the drain wrench to use as a lever. Apply steady, firm pressure, turning counter-clockwise to unscrew the drain flange from the drain shoe below. This may require significant force if the flange is old and sealed tightly.