Quality Customized MC4 Connector for Solar Energy made in China! MC4 is the name of the connection type on all new solar panels, providing an IP67 waterproof and dust proof safe electrical connection. MC4 connectors attached for you to get the power safely out of the solar panel. The more efficient way is to buy the cable which you can cut to the exact length you need and then attach MC4 connectors. We offer a custom cut length cable with MC4 connectors.