This is a great tool set for testing, charging and evacuating refrigerants. Can be used on all car, commercial and domestic air conditioning and refrigeration systems. With built-in safety valve to prevent accidental venting of refrigerant. Refrigerant recharge kit is made of corrosion-resistant metal, the hose is made of high-quality rubber, resistant to , reliable and . Used to check low side pressure for accurate refilling of your air conditioner. AC Gauges, Automotive AC Gauge Set for R12 R22 R404A R134A 100% factory tested, ensure excellent working performance. Perfect for car air conditioning to add refrigerant. Product Function: Product is mainly suitable for pumping and pressurizing operations of refrigeration maintenance, used for refilling refrigerant of the air conditioning system and displays the system pressure in real time. Note: Compatible models are for reference only. Please confirm if it is suitable for you when ordering. Cannot guarantee 100% Due to different