Edwards Signaling Catalog No. 78 pull station is a low voltage device used to perform emergency shutdown of equipment or alert personnel to dangerous conditions. For replacement glass rods, order Part No. P-027024. For use in factories to shut down equipment or production lines in the event of an emergency. Also used to alert personnel to a dangerous condition or to signal personnel evacuation in the event of an emergency. The 78 may be surface mounted or mounted on a gem box or single gang plaster cover.