The Master Flow Air-Tite 6 in. Take-Off provides an airtight seal when connecting insulated flexible duct or round pipe to a flat surface. This take-off can be used to redirect air from any side of the plenum or to transition from a rectangular pipe run. It can be installed with sheet metal screws (sold separately) and is suitable for most HVAC applications. Features: Connects insulated flexible duct or round pipe to a flat surface Can be used to route air from any side of the plenum or to transition from a rectangular pipe run Install with sheet metal screws (not included) Fits most HVAC types for universal application Tacky gasket helps create a secure, airtight seal Seal seams with code-approved mastic, sealant or duct tape (sold separately)