... refrigerant and lubricant, with good sealability.5, SGN/SGR type sight glass adopt anti-explosion crimping structure, the observation ... and independent sight glass structure.Function and characteristicsSGN/SGS type: SGR type: 1, Used for HCFC/HFC refrigerant. 1, ... screw connection5, Two connectors of welded junction and screw type.The relationship between the moisture content and color Moisture ...