Abstract: An electrical connector for a temporary cardiac pacing wire is formed by placing a male lead through a connector body and securing it in place by means of a lockable cap. The male lead is formed by cutting or breaking the shaft of a Keith-type straight needle which is electrically connected to the center lead of the pacing wire. The lead with electrode wire attached thereto is passed through a resilient gasket and through an aperture in the connector body. The lockable cap is then locked onto the connector body so that the lead is sealed and cannot back out of the aperture. A pair of resilient spring-loded arms connected to the cap carry a pair of opposed locking tabs. The locking tabs engage with corresponding locking detents in the connector body. The assembled connector can then be electrically connected in a conventional manner to medical instrumentation by plugging it into a corresponding extension cord set having mating female receptacles that mate with and seal against the body of the male connector.