DuraBlack 6″ SS Tee with Clean-Out Cap The DuraBlack 6″ x 44″ – 68″ Telescoping Straight Pipe Stove Pipe Length from the DuraBlack Series is a component that is used in a typical venting installation. Use for a two-piece installation. Connects directly from stove to ceiling support box or finishing collar. Adjusts from 44″- 68″. Features: Type: Tee with Cap. Cap Type: Clean-Out. Finish: Stainless Steel. Used in a Typical Venting Installation. Use with Rear Exit Appliances and Ones that Require Barometric Damper. UL Listed. Specifications: Inner Diameter: 6″.