Dural's Waterproofing Sealing Kit is a sealing kit for waterproof applications for tiled shower installations. It is made specifically for use with Dural's Foam Backer Board Underlayment (TILITEBD-3248-125) to cover a standard shower installation. Professionals know that corners and joints are the most vulnerable area where moisture can penetrate and cause issues. Our kit ensures a fully water tight seal over these vulnerable corners and also the pipe and mixing valve area with a pipe and mixing valve collar. The waterproof sealing kit includes 4 Internal Corners, 2 External Corners, 1 Mixing Valve Collar, 1 Pipe Collar, 160 screws and 160 washers pack, 5.91 in. x 98 ft. seam tape. Material: Polyethylene.