Flexible vinyl covering protects this RV plug adapter against moisture, sunlight, and wear and tear from outdoor elements. Iron Forge Cables RV power adapter is constructed from a heavy duty 10 gauge wire main line connecting to two 12 gauge branch lines for superior conductivity. Reinforced blades protect the RV electrical adapters prongs from bending or breaking. Slip resistant design. Temperature Range: -40°F to +140°F. UL certified 10/4 STW main line, 12/3 STW branch lines, 14-50P male plug to two TT-30R female receptacles, 30 amp, 125 volt, 3750 watt. Veteran owned.