<strong>Yahoo Message Number: 23648</strong>Chris,<br/><br/>That switch is a Sentrol 1136T. It's a magnetic switch used for alarm systems.(normally on a window) I found mine at an electrical supply house also selling alarm supplies. It can be wired normally open or normally closed.<br/><br/>That's what was used originally, any magnetic switch should work. You may find a better substitute, that switch is...