The purpose of a damper is to control the draft in your chimney. This damper control replaces a broken one or replaces a poker version. The rotary style replacement offers the same result and offers more precise control that a standard version.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.