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 heavy duty 10 gauge wire 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 gauge heavy duty wire, 12 inch, L14-30P male plug to TT-30R female receptacle, 30 amp, 125 volt, 3750 watt. Veteran owned.