Conntek 30125 L6-20P to 6-15/20R Plug Adapter, 20 Amps 250 Volt Plug: NEMA L6-20P (3-Prong 20Amp 250V) Receptacle: NEMA 6-15/20R (T-Blade Style receptacle allows for much more versatility) Max rating when using 6-15R: 3,750 Watts Max rating when using 6-20R: 5,000 Watts