The BERMAD Model FP 400E-7DM Double Interlock Pre-Action, Electric-Pneumatic Release System is suitable for use in systems requiring that water be kept out of the sprinkler piping until an electric detecting device and a sprinkler have both been activated. Electric-Pneumatic Double Interlock Systems include automatic sprinklers attached to a dry sprinkler piping system, with a supplementary Electric Detection System and a Pneumatic Supervised System of low air pressure in the system piping. The Supervised System consists of a Pneumatic Pilot Valve (PORV), and pneumatic low pressure supply. The Double Interlock Pre-Action System admits water into the sprinkler piping only when the detection system triggers the solenoid valve through the control panel, while the PORV is simultaneously activated due to the pressure drop in the Supervised System. An anti-flooding feature is provided by utilizing an in-line check valve, which creates an intermediate vented chamber using a Normally Open drip-check.