The “APM” male flat face coupling series is the Stucchi solution for the manual connection with residual pressure in the circuit. The couplings have a triple valve system: double internal pressure release valve and the flat face valve. This system easily allows the connection of couplings with the presence of high internal residual pressure without fluid loss. Based on this main feature, “APM” couplings are the ideal solution to hydraulic applications where there is the requirement to connect the circuit with internal residual pressure.