The Diesel DPF, Exhaust & Emissions System Cleaner by Rislone cleans the fuel, exhaust, and emissions systems of diesel vehicles to restore power and performance, reduce regeneration cycles, extend diesel particulate filter (DPF) life, save fuel, and turn off check engine lights. It uses detergents to scrub away contaminants, soot, carbon build-up and oily residue from the fuel injectors, combustion chambers, turbo, EGR, diesel oxidation catalyst (DOC), and other components, unclogging blocked DPFs. It installs directly into the fuel tank with no special tools required. Made in the U.S.A.