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Two technicians are discussing refrigerant lines. Technician A says that line connections must be tight but...

Two technicians are discussing refrigerant lines. Technician A says that line connections must be tight but not so tight that air can't get through. Technician B says that all connection O-rings have to be replaced when retrofitting a system to R-134a , Who is correct ?
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Answer #1

Only technician B is correct. Technician A is not correct because the connection should be so tight that air can't get through.

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