8&rdquo; Stainless Steel Vacu-Stack Chimney Cap TDW for Air Cooled Chimney Pipe Vacu-Stack TDW Chimney Caps ideal for double or triple wall air-cooled or air-insulated chimneys Chimney cap constructed of 304 Stainless Steel  will never rust Installation Instructions Included - Made in the USA (Massachusetts) This is the premier chimney cap for solving common, wind-related chimney draft problems for air-cooled chimneys Protects the chimney from rain, snow, animals, and debris