The “APM” male flat face coupling series is Stucchi’s solution for manual connections with residual pressure in the circuit. The couplings have a triple valve system, including a double internal pressure release valve and a flat face valve. This technology easily connects couplings in the presence of high internal residual pressure without causing fluid loss. Based on this major feature, “APM” couplings are the appropriate choice for hydraulic applications that need connecting the circuit with internal residual pressure.