The Lisle Corporation Spill-Free DEF Kit with Adapter for GM, No. 24210, includes a translucent funnel with 6" opening to provide a visual check for technicians to see fluid levels when filling the tank. The adapter securely holds the funnel in place for safe and spill-free filling on 2011 to 2019 Duramax. The kit also includes a 5" straight extension and 45 degree elbow for hard-to-reach DEF fill ports, as well as a lid to keep contaminants out and storage for parts.