Coleman Cable 9901 3-Prong To 2-Prong Adapter, Grounding Outlet Converter, 1-pack Add grounding protection to your outlet with a 3-prong to 2-prong adapter. This converter/adapter will convert a 3-prong plug into a 2-prong plug. Eliminate the need to run extension cords across the room to find available outlets. Grounded and polarized taps and adapters allow you to take advantage of the closest outlet. These are "must-haves" for the home or office! This will convert a 3-prong power plug into a 2-prong while maintaining the ground. Great for plugging 3-prong devices into older sockets or extension cords. If your home/office has outlets with 2 prongs, it means they aren't grounded. The ground wire was added for personal protection. Appliances that have the third prong for the ground, have a portion of the equipment, or casing connected to that ground prong. Then if there are any wires inside the appliance that get loose and make contact with the casing, the current will flow through the ground wire, instead of you. Without the ground connection, you may well be the best or only path to ground and you can receive a shock. Converts a 3-prong power plug into a 2-prong while maintaining grounded protection. Great for plugging 3-prong devices into older sockets or extension cords.