Product Description: Product Description: The Forever Slip- In Round Chimney Cap Professional Model Heavy Duty. 100% Stainless Steel. Fits single wall stove pipe, masonry round clay pipe, flexible chimney lining systems and double wall chimney pipe. Slips inside the chimney flue, secures with a pressure fit. Roll formed 24 gauge hood and base. 8 inch high animal proof mesh screening. Superior 3/4 inch oval holes, that prevents creosote build up. The Forever Cap. "Nothing Else Even Comes Close". From the Manufacturer The Forever Slip- In Round Chimney Cap Professional Model Heavy Duty. 100% Stainless Steel. Fits single wall stove pipe, masonry round clay pipe, flexible chimney lining systems and double wall chimney pipe. Slips inside the chimney flue, secures with a pressure fit. Roll formed 24 gauge hood and base. 8 inch high animal proof mesh screening. Superior 3/4 inch oval holes, that prevents creosote build up. The Forever Cap. "Nothing Else Even Comes Close".