The Storm Collar is designed to go over the top plate and the M-Flex Chimney liner, this is a great alternative if you don’t want to by the Stainless Steel Chimney Liner Kit Cap. If you already own a Chimney Liner Cap and are just connecting the chimney liner up to it, then this will help you solve your problem. The Storm Collar is made out of 100% stainless steel and is Made in the U.S.A.