Observation Ports, Sight Flow Indicators & Blast Gate Valves | Boiler Supplies

Additional Information

Observation Ports & Sight Windows

Observation ports and sight windows are essential for safe and clear monitoring of internal conditions in boilers and industrial equipment. These products are designed to withstand high temperatures and pressures, making them suitable for a variety of applications. Circular sight glass windows, made from borosilicate or tempered glass, offer high optical clarity and resistance to thermal shock, making them ideal for high-pressure environments. Rectangular sight glass windows, also constructed from borosilicate or tempered glass, provide durability and excellent optical properties, making them suitable for high-temperature applications.


High-pressure sight glass assemblies, featuring tempered borosilicate glass with metal frames, are designed to endure extreme pressure conditions and offer high thermal resistance with secure sealing. Flame observation ports, made from cobalt blue borosilicate glass, reduce glare and enhance visibility of flames, smoke, and ash, making them perfect for power plants and marine boilers. Fused quartz sight glasses can withstand continuous use at temperatures up to 1742°F (950°C) and are available in both commercial and optical grades, suitable for high-temperature industrial and laboratory applications.

These observation ports and sight windows ensure safe monitoring, durability under harsh conditions, and clear optical properties. They are available in various shapes and sizes to fit different equipment and application requirements. Custom sizes and expedited shipping options are available upon request.