The Master Flow 4 in. Round Duct Cap, also called a tee-cap or clean-out plug, is constructed of galvanized steel for durability. The duct cap is used to terminate or block off a rectangular duct run in HVAC systems. It can be installed with sheet metal screws sold separately and is suitable for most HVAC applications.Sturdy galvanized steel constructionUse to cap off a round or rectangular duct runInstall with sheet metal screws not includedFits most HVAC types for universal applicationSeal seams with code-approved mastic, sealant or duct tape sold separately
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