Abstract: Cap for a threaded neck beverage container. The cap is based on a rotating ball design and functions as a valve. The ball is embedded in a cylindrical hollow body configured to screw onto the neck of the beverage bottle. The top part of the hollow body will have a hemispherical central depression configured to hold the rotating ball in place, while allowing the ball to rotate about its axis (here two oppositely disposed pivot shafts). In one ball pivot angle, the ball's central fluid passage will be disposed above a body fluid so that fluids from the beverage container may travel through the body fluid port, up through the central opening, and often into the mouth of a user. At other ball pivot angles, the surface of the ball passes over the body fluid port, thus substantially preventing fluids from the beverage container from exiting the container.