A grommet assembly includes a liner, a grommet body, and a lid. The liner is configured to be secured within a hole in a deck surface. The grommet body is configured to move longitudinally within the liner between an extended position and a withdrawn position. The lid is attached to the grommet body in a pivoting configuration and is configured to secure a plug of an outdoor electrical cord fed through the liner from under the deck surface. The lid pivots between a closed position and an open position that permits access to the plug from above the deck surface when the grommet body is in the extended position.