This adaptor allows you to connect a regular Vacu-Stack on a masonry flue. Easy to install, you simply seal the adaptor to the top of the flue with silicone sealant. Next, you turn the wing nut until the ends of the rod are tight at the corners of the flue. The Vacu-Stack then fits into the round portion of the adaptor.
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.