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A valve with 5/16 "SAE (1/2" -20UNF) thread for lossless filling of refrigeration and air conditioning systems with R-410A refrigerant. It is used to connect the refrigerant cylinder to the access valve of the refrigeration or air-conditioning system and to fill it in such a way as to minimize the loss of refrigerant from the filling hoses. This instrument is crucial for a service technician, an entrepreneur dealing with the operation of devices containing controlled substances or HFCs (f-gases).