Abstract: An elongated plug body constructed of dielectric material is provided. One end portion of the body includes a pair of parallel elongated conductive terminals embedded therein and having one pair of ends projecting endwise outwardly of the corresponding body end. The other ends of the terminals are supported in the other end portion of the body for electrical connection with a pair of conductors. The aforementioned one end portion of the body includes a sleeve slidingly telescoped thereover and closed at its outer end by an end wall having a pair of openings formed therethrough in which the terminals are slidingly received and the sleeve is shiftable between an outer position with the free ends of the terminals disposed in the openings and an inner position with the end wall of the sleeve abutted against the end of the body outwardly from which the terminals project. Spring structure yieldingly biases the sleeve toward its outer position.