The Lennox 57A19 Glass Sight is a genuine OEM sight glass designed for use in Lennox HVAC and refrigeration systems. Installed in the refrigerant liquid line, this component allows clear visual inspection of refrigerant flow and condition during system operation. By providing a direct view into the refrigerant line, the sight glass helps technicians identify issues such as low refrigerant charge, flashing, air, moisture contamination, or improper system operation. As an original Lennox replacement part, it is manufactured to meet factory specifications for fit, durability, and long-term reliability.

This glass sight is commonly used during system diagnostics, commissioning, and routine maintenance to ensure proper refrigerant performance and overall system efficiency. Using an OEM Lennox sight glass helps maintain system integrity and supports accurate troubleshooting without modifying or adapting the refrigerant line.

 

Specification:

Manufacturer: Lennox
Part Number: 57A19
Part Type: Refrigerant sight glass
Application: HVAC and refrigeration systems
Function: Visual inspection of refrigerant flow and condition
Installation Location: Refrigerant liquid line
Condition: New, factory OEM part
Compatibility: Designed for select Lennox units; model and serial number verification recommended