4-IN-1 3/4",5/8",1/2",3/8" CAR A/C LINE FUEL PIPE SPRING RELEASE REMOVAL TOOL 4-in-1 car A/C line fuel pipe quick removal tool. Helps disconnect the fuel, heater, or A/C line quickly and easily without damaging the line or fuel filter. This tool releases spring like couplings on fuel and air conditioning lines. Used to release the locking mechanism on all 4 size ranges(3/4", 5/8", 1/2", 3/8").