The NEXIQ Technologies Aftertreatment Service Kit is designed to remove particulates and soot from the filter in a heavy duty diesel's Diesel Oxidation Catalyst. The kit includes the following: 13" aftertreatment adapter, 6" aftertreatment adapter, retaining collar, retaining straps and blow gun assembly. The kit requires a source of compressed air a shop vacuum with a 2.5' diameter hose and dust bag, which are not included.