Pin Stadium Service Port Adapter makes your Pin Stadium installation even more elegant. Check that you have a service port before making this purchase. The service port is located at the right side just inside the coin door of a typical Bally/Williams game from the 90's and at the lower right corner of the backbox of a newer Stern game. Without this adapter you can easily connect your Pin Stadium Lights straight in a wall outlet, but if you have a service port this solution is nicer!