1 Way     Stopcock with two ports, "closed" or "open" position only.

2 Way     Stopcock with 3 ports and 2 positions.  This stopcock has a 
                long arm with 90° rotation.  2 Way Animation

3 Way     Stopcock with 3 ports, a long arm handle of 180° rotation. Not
                allowing an "all open position".  3 Way Animation

4 Way     Stopcock with 3 ports, long or T handle, of 360° rotation, 
                allowing all flow possibilities.  4 Way Animation