Viking supervised Surefire® Preaction Systems utilizing the Viking G-4000P Deluge Valve. The small profile, lightweight, pilot operated Viking G-4000P Deluge valve comes complete with the trim shown on the Datasheet. The system piping is pressurized with air or nitrogen for all Surefire® systems as part of the fail safe release and to supervise the integrity of the piping under normal power conditions.  Surefire® Preaction Systems are commonly used where it is important to control accidental water discharge due to inadvertent damage to the sprinkler piping.