12V/5V Power Adapter For Sega Pinball Machines.  Works with the SAM/WS cable kit.

This adapter is only needed for installation of Apollo 13, Goldeneye, and Twister pinball machines. 

All other Sega 128x32 games shipped from the factory with a 3-pin molex connector in the cabinet (to the right of the coin door) that provides 12V/5V.