Abstract: A coupling is provided between a hose and a fitting, such as can be used to connect to an air conditioning system. The coupling has a stem with a channel extending between first and second ends. The first end of the stem is provided with a nut for securing to the fitting, which fitting can be on the air conditioning system or on a service unit. The second end has a socket for receiving a ball and end of a nipple. The nipple is secured to the hose. The ball and socket arrangement allows the nipple and the hose to rotate 360 degrees around a longitudinal axis of the stem, as well as pivot with respect to the stem.

Abstract: A coupling contains a valve that can be opened or closed to allow refrigerant to pass therethrough. The coupling can be installed onto an air conditioning charging port by sliding a quick disconnect sleeve to a release position along a first end of a valve body. Inside of the valve body is a valve stem that moves between open and closed positions. The valve stem is moved by an actuator sleeve located on a second end of the valve body. The actuator sleeve has a circumferential slot therein. The valve stem cannot be inadvertently opened by fluid pressure because the translational movement of the actuator sleeve and the valve stem is limited by a hose fitting extending through the slot and engaging stop surfaces therein. When the quick disconnect sleeve is in the release position, the actuator sleeve is unable to move the valve stem from the closed position to the open position.