MOTORAD MGC502 Specifications. #MOTORAD Locking Fuel Cap # MGC502 For Ford 2004-16 Ford E-350 Super Duty F-250. They prevent fuel vapor leakage from the filler neck, which is a major source of hydrocarbon emissions, and play a major safety role in preventing the flow of fuel from the tank filler neck when a car is in an accident, including rollovers.Features & Benefits.
