A/C Tubing Repair System - ACRK-3 contains an assortment of SPLICE-LOK fittings for permanent leak repair of any combination of 5/16in, 3/8in, 1/2in, 5/8in, and 3/4in diameters of cracked, kinked or leaking A/C lines using standard hand tools without removing the lines from the vehicle. Repairs can be made on SAE and metric aluminum tube-to- tube, aluminum tube-to-rubber A/C hose, or aluminum tube block-offs. Compression-Style Tube Repair. Fast, economical tube and hose repair. Repair pinhole leaks, cracks, kinks, and rub throughs with SPLICE-LOK in air conditioning, coolant, transmission, oil, or fuel lines. Not for use in brake or clutch systems. - Permanent Leak Repair - Saves Time and Money - Use Standard Hand Tools - Straight or Reducing - Steel/Aluminum/Copper