Abstract: Apparatus for applying a tubular insulating housing to an electrical connector crimped to a wire comprises a horizontal base at one end of which are disposed a pair of wire gripping jaws, one of which is fixed to the base and the other of which is movable by a plunger vertically towards and away from the base. A support having a channel for receiving an electrical connector crimped to a wire is pivotally mounted on the base immediately rearwardly of the fixed jaw, a slide on the base being movable there along towards and away from the fixed jaw through a mechanism operated by the plunger. The slide has at its forward end a recess opening towards the fixed jaw, for receiving a tubular insulating housing.