An adapter (10) for a medical receptacle having a skirt (110) with an outside diameter (112) and a threaded inside diameter (114), and a tapered post (120) within the skirt (110), the adapter includes a proximal end portion (20) having a tapered recess (22) and a threaded surface (23) including at least one thread (24) configured to threadingly engage the threaded inside diameter (114) of the skirt (110), a distal end portion (30) having a surface portion and a cylindrical recess (32), a conduit (40) positioned between the tapered recess (22) and the cylindrical recess (32) such that the conduit (40) is in fluid communication with both the tapered recess (22) and the cylindrical recess (32) and a longitudinal axis. The proximal end portion (20) includes a tapered recess (22) defined by a wall (26), a chamfer (27), and a seat (28) and the surface portion includes a means for gripping (34), which in one embodiment may be at least two wings.
