This POA (Pilot Operated Absolute) valve update set will replace the original unit and convert to a more reliable modern pressure cycling clutch system to improve performance and eliminate sticking pistons.Set includes:POA elim inator tubePressure switchO-ringsWiring harnessDetailed instructionsMade in USA Important: Designed for use with R134A refrigerant. Camaro applications:1967-70 models with ACFirebird applications:1967-69 models with ACChevrolet / GMC Truck applications:1967-72 models with ACImpala / Full Size applications:1966 models with ACChevy II / Nova applications: 1966-73 models with AC.