An electrical plug configured to be mated with a socket, the electrical plug including a substantially tubular plug housing having a front end, a rear end, a side wall between the front end and the rear end, and a housing protrusion on the side wall and configured to be inserted within a socket cutout of the socket, a groove proximate the front end of the housing, and a seal located in the groove and having a cross-section with an outer surface that is substantially similar to an outer surface of a cross-section of the side wall and the housing protrusion.