The Bottle Tap is made up of three parts. A dome, a bushing that acts as an axel, and a flat disk. When the disk and dome are rotated on the axel the concave area of the dome is uncovered by the flat disk. A small portion of the flat disk extends into the concave part of the dome. A much larger portion of the flat disk extends away from the dome. In this position the flat disk forms a catch and lever, which engages the cap under the edge. The lever is lifted upward, lifting the cap from the bottle.
The key chain cable is connected with a common ball chain clasp. To keep the clasp from accidentally coming apart the key chain is fitted with a clasp lock. It fits snugly on the clasp. It is pulled to one side or the other to gain access to the clasp. Then it is possible to remove a cable end from the clasp for key positioning.