OTC 6511 Fuel Line Disconnect Tool Special low-profile design 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 Tool is designed to access the center port on the GM fuel tank sending unit For 3/8" and 1/2" applications Will also service 2001 - current 3/4- and 1-ton trucks with the Duramax diesel engines Lifetime limited warranty