Viking supervised Double-Interlocked Electric/Pneumatic Release Preaction Systems utilizing the Viking G-3000P Valve. The small profile, lightweight, pilot operated Viking G-3000P Valve comes complete as shown on the Datasheet. The system piping is pressurized with air or nitrogen to serve both as a means of supervising the integrity of the piping network and as one portion of the system release operation. Double Interlock Electric/Pneumatic Release Preaction Systems are commonly used in cold storage applications and other areas where it is important to control accidental water discharge due to inadvertent damage to the sprinkler piping.