ADVANTAGE : 1. this smallest size for smallroom fire protection 2. Valve brass , manual ,eletrical sonoid actuated , and automact 3. inside for for filling clean agent , FM200 hfc-227ea gas MAIN PARTS: 1. CYLINDER . SIZE : 2. VALVE 3. SOLENOID ELECTRICAL ACUTOR Other accessories for complete whole system high pressure discharges hose , pressure switch manifold safety valve liquid check valve