Simplex 4004-9302 Description The Simplex 4004R is a two-hazard releasing system that incorporates big-panel features into a small and cost-effective package. Its dual hazards can be programmed to provide an agent release for one hazard and preaction or deluge for the other, giving a high degree of flexibility and protection.  With the early detection capability of the agent release hazard, the fire should be extinguished before the preaction or deluge system is activated.