An adapter for a medical receptacle having an internally threaded skirt with an outside diameter and an inside diameter, and a post within the skirt, includes a proximal end portion having a threaded surface including at least one thread configured to threadingly engage a threaded interior of a skirt of a medical receptacle, and a distal end portion having a surface portion and a generally cylindrical recess. The proximal end portion includes a tapered recess defined by a wall, a chamfer, and a seat and the surface portion includes a gripping mechanism. A conduit is positioned between the tapered recess and the generally cylindrical recess such that the conduit is in fluid communication with both the recess and the generally cylindrical recess.
