4394687 - Genuine Cummins Outlet Catalyst Module

Cummins 4394687 Outlet Catalyst Module - Genuine Cummins SCR Outlet The Cummins 4394687 is a genuine Cummins outlet catalyst module, the final catalyst stage in the aftertreatment assembly. It houses the SCR catalyst, where diesel exhaust fluid injected upstream reacts with NOx and converts it to nitrogen and water before the exhaust leaves the system. Fitment & Specifications: - Engine: Cummins B6.7 - Emissions: EPA 2017 and EPA 2021 Verify fitment with us before ordering to ensure the correct part for your application.