Use these to install HY-C caps when the the flue tile is flush with the chimney crown. Loosely attach legs to each corner of the cap, then position the cap with the legs inside the flue. Finish by tightening the corner screws to secure.
Warning: This product can expose you to chemicals including creosotes, which is known to the State of California to cause cancer, and carbon monoxide, which is known to the State of California to cause birth defects or other reproductive harm.
For more information, go to www.P65Warnings.ca.gov.