Lochinvar & A.O. Smith 100063422 Gasket

The Lochinvar & A.O. Smith 100063422 Gasket is a critical OEM replacement part designed specifically for sealing sight glass assemblies in high-efficiency commercial boilers and water heaters. Engineered to maintain a gas-tight seal under varying thermal loads, this sight glass gasket ensures that combustion monitoring remains safe and efficient. As a genuine 100063422 component (formerly 211866-000), it provides the exact fit required to prevent flue gas leakage or false air intake, which can destabilize burner performance and throw off O2 readings during combustion analysis. This industrial HVAC gasket is built from high-durability materials capable of withstanding the elevated temperatures found at the heat exchanger access port, making it an essential item for any boiler maintenance kit. Professionals trust this part for its precise gasket dimensions and material compatibility with Lochinvar and A.O. Smith equipment, or any commercial water heater requiring this specific technical footprint.

• Optimized Pressure Retention: Maintains a reliable seal at the viewing port, preventing hazardous flue gas bypass during high-fire operation.
• Chemical and Thermal Resistance: Formulated to resist degradation from high-heat cycles and combustion byproducts common in condensing systems.
• Direct OEM Compatibility: Ensures a perfect seat without the need for trimming, reducing the risk of sight glass cracking due to uneven torque.
• Precision Tolerance: Meets exact A.O. Smith 100063422 specifications for zero-gap sealing in pressurized combustion chambers.

• What causes a sight glass gasket to fail prematurely? Most failures result from excessive heat exposure, over-torquing the observation port bolts, or improper seating during a burner inspection. Always check for brittle edges or compression set.
• Is this gasket compatible with older Lochinvar models? Yes, this part replaces 211866-000 and is used extensively across multiple generations of Lochinvar and A.O. Smith commercial units; verify your specific parts manual for cross-reference.
• Do I need to apply sealant with this gasket? No, this gasket is designed to create a mechanical seal upon compression; adding RTV or other sealants can interfere with the seat and complicate future maintenance.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.