Pinball Life 4-ball trough.  

This trough can be used as a 1-ball, 2-ball, or 3-ball trough by simply removing any unused switches.

High quality PCB opto boards are used for tracking the ball in position 1 and the jam/stacked ball position.

It really doesn't get any more straight ahead and easy to use than this!  Perfect for homebrew machines.

Need a ball trough that handles up to 8 pinballs?  Check out the link below.

Pinball Life #PBL-100-0015-00.