Patterson-Kelley 26-0000-0046 Sight Glass ROBAX C300-C1050

The Patterson-Kelley 26-0000-0046 Sight Glass is a transparent viewing component made from ROBAX ceramic glass, rated for high-temperature boiler conditions and designed for C300 to C1050 series units. In HVAC systems, it is installed on commercial boilers where it provides a direct visual path into the combustion chamber and water section. It is positioned on the boiler body between the sealed enclosure and internal chamber, allowing operators to observe flame conditions and fluid movement during operation. This monitor internal boiler activity in commercial and residential heating equipment.