The push-to-close drain plug is a convenient device that does not require any mechanical parts, such as the lever for a pull-up drain plug. To close the drain plug, you simply push it down. Push on the drain plug again and it will pop up to release the water. The spring mechanism in the drain plug eventually will wear out. The plug may not catch when pushed down, or it may stay down and not pop back up. Either way, the drain plug must be replaced.
Push the drain plug down if it is stuck in the up position. Turn the drain plug in a counterclockwise direction while simultaneously pushing down with moderate pressure. Turn the drain plug until it comes free of the assembly.
Turn the brass peg counterclockwise using the pliers to remove it if your drain plug is the type with a brass peg. Turn the large plastic screw counterclockwise using the screwdriver to remove it if the drain plug has this type of assembly.
Lift out the drain plug assembly after removing the peg or screw. Clean all debris, hair and soap scum from the cross bars in the drain. Replace the drain stopper by inserting the new stopper assembly into the drain and turning it in a clockwise direction.