TRIMPAC® Model B-4, B-4B & B-4S is a factory assembled trim package for a single interlocked preaction system with a 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-4, B-4B & B-4S provides access doors for the emergency release (B.1) and alarm test valve (B.7) for manual operation of these trim valves. TRIMPAC® Model B-4, B-4B & B-4S is equipped with priming water pressure and water supply gauge view-ports for easy monitoring of water pressures.