This Master Flow 10 in. x 4 in. Register Box Saddle allows you to cut an opening of the appropriate size into the branch line and secures the saddle over the hole. Installs with sheet metal screws (not included). Seal and insulate ductwork for system efficiency and comfort.
Creates a horizontal transition from round pipe to an air register or grille
Install with sheet metal screws
Designed to fit over a section of round pipe while securing the saddle over the hole
Easily cuts down if necessary
Seal seams with code-approved mastic， sealant or duct tape (not included)
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