This rectangular bell air horn fits Mack applications and measures 12.001 in. in height, width, and length for a compact, cab-mounted profile. It is built as a replacement for the truck’s exterior warning horn, using compressed air forced through the flared bell to project a loud signal. Sold individually.Interchanges:Mack 38MR4228MEM44940FeaturesRectangular bell air horn designHeight, width, and length each 12.001 in.Sold individually (EACH)PartTech SpecsHeight: 12.001 in.Width: 12.001 in.Length: 12.001 in.Unit of Measure: EACH