Replacement liner top chimney cap for double wall prefab chimney pipe or flexible relining systems. Removable hood and screening for easy cleaning. 9" screen height, 3/4" animial proof oval hole mesh. Inside 1/2" lip keeps water from rolling back into the flue. Stainless Steel Lifetime Warranty Made in the USA. Outer ring is 17" I. D. Collar is 9-7/8" O. D.