Abstract: A submersible set screw connector has a conductive metal block with a series of blind conductor holes and corresponding set screws to clamp and secure the conductor ends to the block. The connector is provided with a waterproof case which includes elongated grommet receiving sleeves for each conductor. Access to the set screws is provided through cylindrical projecting ports, each of which includes a waterproof plug. Each plug is tethered to the case so it can not be lost. The tether extends from a small hole in a radial tab on the plug to a small hole on a fin projecting from the case. The tab keeps the tether radially outside the cylindrical projecting ports. The plug and port are configured to interfit to form a tight seal.