TW Series THRU-WALL BARRIER® Cable/Conduit Sealing Device consists of TWF frames assembled with TWB Sealing Block Assemblies. The following combinations have been classified by Underwriters Laboratories, Inc. The UL classification includes TWF6, TWF10, TWF20, TWF24 and TWF30 frames either grouted into masonry or concrete or cast into concrete installations. The inside of the frames may be coated with a silicone lubricant just prior to installation of TWB Sealing Block Assemblies. The lubricants to be used are Silipicone® Brand Release Agent made by Dow Corning Corporation or #206 All Purpose Silicone Lubricant made by Sprayon Products Division of The Sherwin-Williams Company. These will be supplied by Cooper Crouse-Hinds as TWL1 or may be obtained independently. The appropriate reducers (TWR2 or TWR3) are used in conjunction with cables having an O.D. smaller than the diameter range of the opening in the TWB Sealing Block Assemblies.