An apparatus and method for sealing an electrical connection, such as a connection between two electrical extension cords, thereby protecting the electrical connection from moisture or water intrusion. The electrical connection is surrounded by a flexible, substantially water-impermeable material, such as a plastic sheet. The sheet has strips of adhesive around its perimeter. The sheet is wrapped around the electrical connection such that adhesive on one portion of the sheet is joined to adhesive on another portion of the sheet to form a sealed volume that surrounds the electrical connection. The electrical connection also may be sealed within a plastic sleeve having adhesive strips along the inside edge of the opening at each end of the sleeve. The sealing apparatus is a temporary, disposable, one-time use item that quickly and easily seals connections between extension cords, such as three-prong plug-in type extension cords used outdoors at concert venues, sporting events, construction sites and the like.