The key feature of the Blackburn® SQUID™ System is its sealing method. There's no tape, no compound, no heat source required just an EPDM rubber sealing sleeve that grips the conductor insulation on one end and seals onto the insulated bus on the other end. What makes it possible EPDM rubber the elastomer with a memory. It always returns to its original shape. An underground system is only as good as its sealing quality and the SQUID™ design provides the best.