An apparatus for sealing a passage through tissue includes a threaded plug detachably carried on a distal end of a delivery device. A guide wire element is receivable through the lumens extending through the plug and delivery device that includes expandable wings adjacent its distal end, and markers adjacent its proximal end. During use, the guide wire element is advanced through a passage through tissue into a blood vessel. The wings on the distal end are expanded within the vessel, and the guide wire element withdrawn until the wings contact a wall of the vessel. The plug is moved into the passage over the guide wire element. The distal portion of the guide wire may be secured to the plug, e.g., by compressing a collet within the plug lumen that seals the lumen, and is severed from a proximal portion.
