The Kidde® Conventional SPST and DPST Series 3300 Manual Pull Stations are high quality, non-coded alarm initiating devices. The Manual Pull Stations are constructed of heavy die-cast aluminum for long life and use an internal toggle switch for reliable operation. The SPST Manual Pull Station provides a Single Pole, Single Throw switch with screw terminal connections for wiring to the Fire Alarm/Suppression Control Unit. The DPST Manual Pull Station provides a Dual Pole, Single Throw switch with screw terminal connections. One set of contacts must be wired to the Fire Alarm/Suppression Control Unit and the other may be used for local or remote annunciation.