DuraLiner 6″ Round Tee with Round Branch and Cap This DuraLiner 6 Inch Chimney Relining Round Tee and Round Branch with Cap efficiently helps venting of heating appliances while protecting masonry chimneys from the damaging effects of flue gas. Provides connection between Masonry Wall Thimble, Wall Pass Through, or stove connector pipe to round DuraLiner. Branch is removable. Features: Type: Tee with Cap. Tee Shape: Round. Round Branch. Removable Branch. Provides Connection between Masonry Wall Thimble. UL Listed. Specifications: Overall Dimensions: 8″ (W) x 15.12″ (H). Inner Diameter: 6″.