Demco Manual Call Point D-108 is suitable for open or close circuit system and is professionally designed for use in fire detection systems with central control equipment. Alternative terminals are provided for open or close circuits. When wired for open or close circuits. When wired for open circuit operation, the circuit closes instantly when the glass is smashed. Openings are provided for 3/4 Ø conduit entries from top, bottom and the back. All metal parts are made of brass and phosphor bronze to ensure life long resistance against corrosion. A high realibility micro switch is also included. D-108 is designed to meet the requirement of BS5839 Part 2, EN54 Part 2 and approved by Australian Standard AS 1603 Part 5.