A replacement liner top chimney cap for triple wall air cooled factory-built prefab chimney pipe. Removable hood and screening for easy cleaning. 9" screen height, 3/4" animal proof oval hole mesh. Raised 13" inner ring with a 1/2" lip prevents the water from rolling back into the flue. Stainless Steel Lifetime Warranty Made in the USA. Outer ring is 17-1/4" I. D. Collar is 9-7/8"