Very useful when plugging in your RV to a standard 15 amp household outlet. This little adapter allows you to plug in your RV to any regular appliance outlet. Designed for RV applications only. On most outlets you should try not to exceed 15 amps or 1650 watts, but on NEMA 5-20 outlets (where one of the slots is T-shaped) you can usually go up to 20 amps or 2200 watts.