Edwards Signaling 276B / 277B / 278B / 279B series of fire alarm pull stations are for fire alarm installations in schools, hospitals, factories, and industrial locations. They are dual action devices molded from Lexan. Kidde pull stations are supplied with screw terminals for easy field wiring. For replacement glass rods, order Catalog No. 276-GLR (pkg. of 20). Tamper proof reset action. They may be semi-flush mounted using a 4" (102mm) square back box, with a minimum depth of 2 1/4" (57mm), and a single gang plaster cover. It may also be surface mounted using the Catalog No. 276B-RSB back box.