12 Foot White Extension Cord with Slide Covers for unused plugs.  - UL Listed - 125 v - 13A - 1625W
The plug part is on a triangle to save some room on power strips.  Also, the socket part has 3 ports with a slide mechanism to "Close" that particular socket rather than having a loose cover.  
  • Hubby had stroke and can not put up lights any more - selling all supplies for this project.