... as recovery, regeneration, vacuum,filling(oil,refrigerant)and monitoring. Manually-operated Refrigerant Recovery and Filling Machine HS-520Connection:1/4SAE ... quick coupler with ball valveRefrigerant: R22 or R134a or R404a .Features: functions for recovery, regeneration, vacuum,filling ... Manually-operated Refrigerant Recovery and Filling Machine HS-520