Regardless of chimney brand or type, the universal Weathershield is the best cap for all standard Class A chimney systems. An exclusive spring-tension connector assures a self-adjusting secure fit. Protects chimney from adverse weather. Keeps out debris and animals. Features: 100% Stainless Steel Construction, Installs Easily, Self-adjusting Spring Base, Lifetime Limited Warranty, Standard 1" Mesh Screen, Removable Top For Easy Flue Access, Easy Maintenance, Tested To UL 103 Standard. Note: A Masonry Adapter, purchased separately, is required when installing a Weathershield in a masonry chimney. Masonry Adapters Include Fasteners 7'' Stainless Steel Class A WeatherShield