SEPTEMBER JLC 1998 Products JLC's Products by Pete Young Temporary Dust Barrier Remodelers often need a temporary dust barrier that is both easy to install and does not damage ceiling, wall, or floor finishes. ZipWall seems to fit the bill. Each telescopic pole has a top plate that securely friction-seals plastic, canvas, or dropcloth material against the ceiling; non-marring feet do the same on the floor. The poles are extendable to 12 feet and retail as a pair for $139. Contact: ZipWall, 20 Summer St., Stamford, CT 06901; 800/718-2255; Romex Connectors Made of non-conductive plastic, NM94 and NM95 Black Buttons snap into 1/2-inch (7.5¢) or 3/4-inch (15¢) knockout holes with light finger pressure. They accept a wide range of single