This Lock-Top damper seals tight to keep heat in house when the fireplace is not burning. The Lock-Top design seals with a silicone rubber gasket. Protects your home against heat/air-conditioning loss up the chimney, and prevents downdrafts, rain leaks, and insects. A cable drops down the flue and attaches to a control handle mounted in the fire box.
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.