E-z-mate Series are exhaust type quick couplers that are designed to safely relieve air pressure prior to disconnection. When the valve sleeve is twisted to shut off air flow, it automatically vents downstream allowing for disconnection at zero pressure and eliminating the risk of hose whip. Self- locking valve sleeve protects against accidental disconnection. Push-to-connect operation. Meets ISO 4414 requirements for a controlled pressure release system. Connection and disconnection at zero pressure. Brass material option - contact QCD for availability.