Features and Benefits: Special low-profile design works in close quarters; Designed to access the center port on GM fuel tank sending unit; For 3/8″ and 1/2″ applications; will also service 2001 thru current 3/4- and 1-ton trucks with the Duramax Diesel engines; Works in close quarters on GM, Ford, and Chrysler vehicles where there is limited clearance between the fuel line fittings and fuel filters, fuel rails, or sending units.