Abstract: A stopper apparatus comprising a flat upper portion having a centrally-located circular indention facing upward, an activation element having a circular, planer disc loosely engaging the circular indention, a vertically-oriented panel, and a male-threaded stem descending on a vertical axis of the disc, a reinforced circular lower horizontal panel having a centrally-located internally-threaded post extending vertically from the lower horizontal panel and engaging the internally-threaded post, and a bladder of rubberlike material disposed between the lower horizontal panel and the flat, reinforced upper portion, the bladder having a central passage through which the stem and post pass, and an internal cavity.