EZ Chill EZC110-4 Reusable Gauge and HoseThe gauge is able to diagnose if a recharge is needed, identify the current low side pressure in the system and determine increases in pressure during the recharge process. This product is compatible with both sealed and self sealing R 134a cans. Highlights: Color : Blue Includes recharge hose with in line gauge Compatible with both sealed and self sealing R 134a cans Built in safety valve to prevent accidental venting of refrigerant R 134a recharge