7" DuraVent DuraPlus Stainless Steel Chimney Cap 7DP-VC 7" DuraPlus Stainless Steel Chimney Cap is required where the chimney pipe terminates above the roof line. Removable screws allow for cleaning of the chimney and spark arrestor screen. Diameter: 7" Height: 6" Stainless Steel Removable Screws .016” 430 stainless steel outer wall or .018” galvanized steel outer wall. .018” aluminized steel intermediate liner. .016” 430 stainless steel inner liner. Insulated layers plus ventilated air space. Locks tightly with a precision twist-lock connection.