sight glass(moisture indicator) is a kind of element which shows the moisture and the flow of refrigerant.
Descriptions
1. The content of refrigerant in the line of the system;
2. The content of water in the refrigerant;
3. Indicates the oil level of compressor crooked.
4. SG-series have indicator paper whose color changes can indicate the content of water in the refrigerant;
5. The glasses and the "O" ring can make sure there is no leak of the refrigerant;
6. Max. Working Pressure: 35bar (500psig);
7. The temperature of the medium: -50 oC - +110 oC;
8. The content of water is low, the color will change blue while high it will change pink which shows that filter dryer in the system needs to be changed.

sight glass, refrigeration sight glass, HVAC part
1/4" double flare with two nuts
3/8" double flare with two nuts
1/2" double flare with two nuts
5/8" double flare with two nuts
1/4" brass solder type
3/8" brass solder type
1/2" brass solder type
5/8" brass solder type
1/4" extended copper tube solder type
3/8" extended copper tube solder type
1/2" extended copper tube solder type
5/8" extended copper tube solder type