【Tin-Plated, Avoid Overheating】KOOTANS semi trailer electrical cord has tinned wire ends, which can effectively prevent copper wire from oxidation and avoid overheating of the contact surface. The tin oxide can enhance the 7 way electrical cord conductivity and makes the transmission performance of wires more stable and reliable. 【Copper Material】Our 7 way coiled trailer light cord is made of high-quality pure copper, which has good conductivity, ensures the stability of various lights function and makes truck cable more durable to use. 【7-Way Plug】Heavy-duty 7 pin plug meet the requirements of SAE J560 standard. Zinc-plated surface to avoid corrsion and double gusseted handles for easy operation. Galvanzed brass terminals to provide accurate and stable ferformance. Equipped with strong spring joint can effectivily protect the 7 way cable and release the stress on the connection during the tight turns. 【Perfect Fit】This semi electrical pigtail cord is a good solution for replacing worn out power cord of your trailer. Replace for Philips 30-4621, for Velvac 590161, for Sloan 421130, for Tectran 7ATG522MG, for PDC EL27715, for Tremec 4D015. 【Satisfied Service】We offer replacement or refund service to our customers, if you are not satisfied with this product, please contact us for a satisfactory solution.