Master Flow 10 in. x 4 in. - 8 in. 90-Degree Register Box

The Master Flow 10 in. x 4 in. x 8 in. 90° register box creates a right-angle (90°) transition from 8 in. round pipe or insulated flexible duct to a 10 in. x 4 in. air register or grille. This register box is made of 30-Gauge, galvanized steel to provide strength and durability. It can be installed with sheet-metal screws.