DEF Filler Funnel Update Kit Allows fast and clean filling of DEF (Diesel Exhaust Fluid), also known as Ad Blue. Special threaded connector to fit all standard DEF systems. Special threaded adapter to fit GMC and other Domestic systems. Elbow adapter to create angle. Shut-off valve to prevent spillage. Air-bleed line for fast flow. Built in screen to prevent contaminants entering system. Funnel body features wide-mouthed opening & built in handle. Allows easy, one-man, filling with large (10L) containers, saving time & money 7220U No -