Abstract: An adjustable pop-up drain stopper assembly is provided comprising a push rod gear and pivot rod gear, both of which are housed in an enclosure. The push rod and pivot rod gears rotate about respective axles in the enclosure. The push rod gear and the pivot rod gear both have a lever arm extending through respective windows in the enclosure and are connected to a push rod and a pivot rod, respectively, of a sink. Teeth at arcuate ends of the push rod and pivot rod gears engage each other such that, when the push rod gear is rotated about its axle, the pivot rod gear rotates a corresponding amount about its axle. In use, when the push rod is raised or lowered, the motion is transferred by way of the gears to the pivot rod which, in turn, lowers or raises a pop-up stopper at the sink drain opening.