... design 5,competitive price Brief introduction1,SGN/SGS type sight glass is used for liquid channel of refrigeration and air ... sealing ,material, is suitable for various refrigerant and lubricant, with good sealability.5, SGN/SGR type sight glass adopt ... Have liquid level in reservior3, Without condensate depression indication for refrigerant liquid. 3, Liquid level in compressor crankcase4 Showing ...