Conntek 30126 L5-30P to 5-15/20R Plug Adapter Plug: NEMA L5-30P Receptacle: NEMA 5-15/20R (T-Blade Style) Max Power: 2,500 Watts This adapter is useful for taking a 3-prong locking outlet and turning it into a standard household outlet that accepts either a 15A or 20A straight blade plug