This durable cap is a replacement for the standard caps that are typically found on round metal chimneys with either wood, metal, pre-fab square or rectangle housing. Unlike the caps that come with these housings, our PREMIUM PRE-FAB CAP® are made of 24 gauge 304 stainless steel and will never rust or rot out. The lid is removable to make future cleanings a snap. Available in five stock sizes with a 7″ opening. Additional styles in any custom size available upon request. A 5/8″ spark arrestor available on all models. Also available in 100% Copper, not Copper-Plated Stainless Steel.