inserted into a service entrance and the larger diameter second end is adapted to be visually seen within the underground water conduit the bottom winglet 38 disposed on the second end has a larger diameter than the flexible winglets 36 is marginally thicker than flexible winglets 36 and is designed to rest on the edge or perimeter of the service entrance as illustrated in fig3 a the bottom winglet 38 includes an antenna coil 40 connected to a light emitter 42 located exactly in the center of the winglet 38 the antenna coil 40 is adapted to generate a small electrical current when subjected to an electromagnetic field that will turn on the light emitter 42 with reference to fig4 and 4 a a second embodiment of a plug is illustrated consisting of a two piece plug 33 which also includes of a conical hollowed body 34 made of a soft plastic surrounded by a series of flexible winglets 36 adapted to bend when the hollowed body 34 is inserted into the service entrance in order to efficiently seal the service entrance the body 34 has first and second ends wherein the smaller diameter first end is adapted to be inserted into a service.