Ford AC And Fuel Line spring lock coupling tool Features and Benefits: Release of locking mechanism on all 4 sizes: A (3/4″); B (5/8″); C (1/2″) and D (3/8″) Use with Ford air conditioning or fuel line spring locks This is a very handy tool to have when working with Ford air-conditioning or fuel line spring locks. Most Ford vehicles are equipped with spring lock couplings. This tool is necessary for the release of locking mechanism on all 4 sizes: A (3/4″); B (5/8″); C (1/2″) and D (3/8″). Do not use with engine running. Release system pressure before disconnecting coupling. Click Here. Double your traffic. Get Vendio Gallery – Now FREE!