TRIMPAC® Model B-5 Double Interlock Preaction System with Electric/Pneumatic Release, Galvanized TRIMPAC® Model B-5 is a factory assembled trim package for a double interlocked preaction system with an electric/pneumatic release module in a metal enclosure. The standard trim normally required on a deluge valve has been moved to a single cabinet. TRIMPAC® Model B-5 provides access doors for the emergency release and alarm test valve for manual operation of these trim valves. TRIMPAC® Model B-5 is equipped with priming water pressure and water supply gauge view-ports for easy monitoring of water pressures.