Specially designed to screw directly on to the AdBlue® tank filler neck where the tank is fitted with a vertically accessed filler (boot floors, under bonnet areas etc.). The funnel valve allows the user to stop the filling process even when there is fluid still in the funnel to help avoid over filling the tank. * For safe transfer of Adblue® from storage containers to the vehicle tank. Equipped with manually operated anti-spill valve. * 1100ml transparent funnel with scale. * Equipped with a lid to keep out dirt and debris when not in use. * Air breather pipe to allow air out of the tank, prevent splashing caused by bubbling and help prevent over filling. * For angled AdBlue® filler necks, please check 3984-WW.