Attributes . The Polaris ISPB350-4 4-Port Single-Sided Submersible Connector provides the simplest solution for forming a secure connection between up to four conductors in direct burial or temporary submersal applications with a wide range of wire sizes. Sized for 350 MCM - 12 AWG wires and rated for 600V, this pre-insulated connector comes pre-loaded with an oxide inhibitor and installs faster than traditional uninsulated connector options using just a hex key and torque wrench. The aluminum alloy body is wrapped in . Names