The FAMCO ATASS Tile Cap Adapter allows a square chimney tile or flue to accept round caps to terminations. The adapter fits over masonry and tile chimneys. This product includes a draw bolt collar for easy installation and a secure fit. Quality constructed in 28 gauge Stainless steel. The FAMCO ATASS Tile Cap Adapter is a custom item requiring your exact length, width and perimeter measurements for the outside dimensions of your flue. There are 5 sizes available to fit over masonry measuring 8×8″, 8×12″, 12×12″, 12×16″, and 16×16″. These sizes work with a range of diameter openings from 6″ to 16″. The over all height of the adapter is 3½”. Make sure to take accurate measurements to ensure ordering the correct size. The FAMCO ATASS Tile Adapter is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this adapter, please refer to the FAQs above or feel free to contact us by phone or email.