A self-venting, single shut-off safety coupling socket with a male thread. The coupling will self-vent during disconnection, with no risk of pressurised hoses being freed. When the sleeve of the coupling is pulled back, the plug is released yet remains locked in. The coupling valve closes and the air is vented from the air line at the same time. Then, when the sleeve is once again operated, uncoupling takes place safely. * Thread size R1/4 * Single handed operation * Optimum flow and low pressure drop * Compact and robust nickel plated brass construction * Operating pressure 0 to 12 Bar * Air flow factor 1.25 * Ambient/media temperature -20°C to +100°C