An adapter for a medical receptacle having a skirt with an outside diameter and a threaded inside diameter, and a tapered post within the skirt, the adapter includes a proximal end portion having a threaded surface including at least one thread configured to threadingly engage the threaded inside diameter of the skirt, a distal end portion having a surface portion and a cylindrical recess, a conduit positioned between the tapered recess and the cylindrical recess such that the conduit is in fluid communication with both the tapered recess and the cylindrical recess; and a longitudinal axis. The proximal end portion includes a tapered recess defined by a wall, a chamfer, and a seat and the surface portion includes a means for gripping, which in one embodiment may be at least two wings.