Duct O-Ring, Product Type Duct O-Ring, For Nominal Duct Diameter 9 in, Seal Material Nitrile, Weight 0.1 lb, Maximum Temperature Rating 158 Degrees F, Inside Diameter 9 in, Compatible with Series QF Duct Work, Material Nitrile, Outside Diameter 9 in, Color Black, Compatible with Brand Nordfab, Series QF