Product details:

Converting your factory built chimney into a convenient direct vent system is simple with this VentPro conversion kit by Dura-Vent. This conversion kit is a unitized, coaxial venting system designed for use with direct vent gas or propane (Type C) heaters and fireplaces. This kits is compatible with the following manufacturers DuraPlus, American Metals, Air-Jet, and MetalFab, and are for use with pipes that are 8 in. inner diameter. These kits are constructed with .020 in aluminum inner wall, and .018 in. galvanized steel outer wall, and includes the cap adaptor and retro connector collar.