a device for monitoring the flow of fluid in a pair of conduits and blocking the flow of fluid in a conduit when leakage of fluid is sensed therein the device is provided with a pair of inlet and outlet passageways in which fluid flows to and from the conduits a pair of solenoid operated shutoff valves for blocking the flow of fluid in the inlet passageways and a pair of check valves for blocking the backflow of fluid through the outlet passageways means are supplied for sensing the flow of fluid through the passageways and translating the same into an electrical signal for comparison with a norm and actuating the closing of a shutoff valve to block the flow of fluid into a conduit which is connected between an inlet and outlet passageway in which the electrical signal corresponding to the flow of fluid therein differs from the norm the means being designed to delay actuation of the shutoff valve until it is determined that the change in signal from the norm is the result of actual leakage of fluid from the conduit application_number US 23849781 A description with general reference to fig2 8 for like parts and particular reference to fig6 there is shown an improved fluid flow control monitoring device 21 which includes an outer housing 22 a fluid inlet 23 through which fluid initially enters the device 21 a pair of generally s shaped inlet passageways 24 25 leading from the fluid inlet 23 for dividing the flow of fluid entering the fluid inlet 23 into two branches the inlet passageways 24 25 terminating respectively at a pair of discharge ports.