[img]https://brickinsights.com/index.php/crop/teaser_compact/sets/5120-1.jpg[/img] 
[url="https://brickinsights.com/index.php/sets/5120-1"][b]5120-1 Polarity Reversal Switch for 8082 (9V)[/b][/url] 
[url="http://guide.lugnet.com/set/5120"][/url] 75 / 100