Byson line of Sightglass components. Sight glass offers optimal visibility and is designed to cover higher pressure applications with a Maximum Working Pressure. Sight glasses are fitted with an indicator, which changes colour to show the moisture content in the refrigerant. The sight glass will also indicate a lack of sub cooling or a shortage of refrigerant in the system. Features: Working temperature range: -50 °C to 80 °C Moisture indicator: Green for dry, Yellow for wet. Enhanced light reflection allows easy viewing of refrigerant state. Very reliable due to minimal dependency on temperature. Refrigerant-optimised seal, for superior system safety and leak prevention year after year. Optimal indicator performance protects your system and reduces the risk of compressor damage.