S.U.R.&R.'s A/C hose to compression fittings allow you to make instant repairs to A/C lines on hundreds of vehicles. Repair failed collar crimps, sections of corroded line, cracks, kinks and more on any SAE or metric sized aluminum line for a fraction of Product Features:American Quality - Proudly Made In AmericaOn the car repairs made simpleMake connections easily by hand; no specialty tools required.Compression unions and adapters specifically designed for A/C line repair applications AC repair system is pressure rated up to 600 psiDrastically cuts labor timePressure rated up to 600 psiMade out of aluminum; will not rust