Qbace 3/8" 1/2" 5/8" 3/4" Fuel Lines Quick Disconnect Coupling Repair Tool Spring Lock Car Air Conditioning Used on 1981 the current Ford cars and pickups having spring lock. Connection on the A/C system.For 3/8", 1/2", 5/8" and 3/4" couplers. Disconnect tool designed to fit quick-connect fuel line fasteners. Works on various vehicles and separate fuel lines without damaging the connectors. Separate spring-lock refrigerant pressure lines on A/C systems on most late model Ford, Chrysler and Jeep vehicles. Spring-loaded design and durable plastic body.