Sight glasses are used to indicate the condition of the refrigerant, the moisture content in the refrigerant and the flow in the oil return line.

- Max. working pressure : 680 psig (48kg/cm2)
- Max. temperature rating : 450℉(232℃)
- Forged brass construction with clear fused glass window indicating element protected by filter screen
- Designed as fully hermetic
- 5% of moisture sensitivity
- Extended copper connections for easy brazing
- Forged brass body
- Reliable and accurate color calibration at low ppm and high temperature