Pro Installer Link Joiner 3-WayPro Installer link bars provide the fastest and most economical way of connecting the Pro Installer line of products to save space and allow for the most compact installations. The common interconnection height of Pro Installer components allows link bars to quickly and easily convert a group of different products into a functional cluster. Pro Installer link bars are made of high purity copper and are tin plated for optimum marine electrical performance. Links can be doubled to accommodate higher loads.