For easy and trouble-free separation of quick disconnect and spring lock couplers found on most late model domestic and import vehicles Set includes tools for use on 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 and 7/8: Fuel lines Fuel filter Fuel pressure regulators Fuel return lines A/C Fittings Oil cooler lines Transmission oil cooler lines Radiator cooler lines Vehicle specific applications