Package Includes: 3 PCS valve core remover tool, 10 PCS R134A refrigeration schrader valve cores, 20 PCS R12 refrigeration schrader valve cores, 5 PCS R1234YF refrigeration schrader valve cores, 20 PCS O-ring rubber seals Application: Will work on both R134A and R1234YF automotive air conditioner systems. 1 Set of R134A R1234YF Valve Core Remover and Installer Tool Replace Part Number: R134A, R1234YF R134A R1234YF Air Condition Valve Core Quick Remover Installer Tool Kit Uuiauoio Valve Core Remover Installer Tool, Valve Core Remover, Dual Size 1/4-5/16 Port Valve Core Removal Installer Refrigeration Air Conditioning Lin 4ad2b979 F88e 4d34 9ef2 Cf3dd0d1aceb.7f9f59828aa3a4a2deb4be56b3875239 Installation Reminder: Professional installation is highly recommended 3 X valve core remover tool. This design reduces the chances of leaks and prevents the escape of refrigerant. 10 X R134A refrigeration schrader valve cores Replacement for R1234YF automotive air conditioning systems Fitment: Replacement for R134A automotive air conditioning systems.