Generator Twist Lock Plug Adapter, Elegrp Nema L14-30P And Nema, Black/White). ??Toughened Nylon Construction + Copper Brass Contacts? Insulated and solid nylon housing will keep non-current carrying parts from becoming energized and won?t crack in high abuse applications. Formed from a single piece of solid brass to reduce friction and overheating, providing excellent conductivity. ??Tight Lock? Secure locking design that plug is locking tightly on electrical equipment to keep it from vibrating loose and falling out. Internal cord clamp assures secure wire connection. ??Safe Enough? Each wire slide into a separate tube and to be tightened to prevent shorting or stray strands. Flexible rubber dust seal prevents moisture and contaminants from entering the wiring chamber. ??Good to Use and Install? Ergonomic fluted body design with radial grip ridge is ideal for gripping, turning and pulling. Face and body feature alignment make it easy to assemble. Grip screws are installed from the same side to make tightening easy. Pocketed recess for cord grip screws deters the slippage of the screwdriver. ??Wide Application? Typically used for generators, temporary power solution, transfer switches, welding equipment, RV, trailer camper trailer camper welding equipment, etc.