High Tide Marine and Happy Trails RV Cords presents our new heavy duty adapter. This adapter changes from a 30A, 125V plug source to a 50 amp, 125/250V source. Features include: Heavy Duty 10/3 Gauge Wire Bright Yellow Color for Improved Visibility Adjustable Sealine Collars to ensure a Watertight Seal LED indicator on 50A end of adapter All ECS Premier products are of exceptional quality, allowing you to purchase with confidence. Connector specifications: 1x NEMA L5-30P (male) 125V 1x NEMA SS2-50R (female) 125V/250V NOTE: This adapter will NOT work in a 50A, 125V shore power, ONLY 50A, 125/250V