Lochinvar & A.O. Smith 100290345 Gasket

As a direct OEM replacement for the discontinued GKT1010 and 100146289, the Lochinvar & A.O. Smith 100290345 Gasket is a critical sealing component for water heaters and boilers. This hand hole gasket is precision-engineered to withstand the intense thermal cycling and high-pressure environments typical of commercial heating applications. Manufactured from high-grade EPDM or spiral-wound materials, it ensures a leak-proof seal at the inspection plate, preventing fluid loss and maintaining system vacuum or pressure integrity. For technicians performing routine maintenance or scale removal, this boiler handhole gasket provides the exact physical dimensions required for a flush fit on standard Lochinvar Knight and A.O. Smith commercial water heater hand hole plates. Utilizing an OEM 100290345 replacement is the most reliable way to avoid the misalignment and "shouldering" issues often encountered with generic multi-fit seals in the field.

• Direct Compatibility: Engineered as the exact replacement for GKT1010 and 100146289, ensuring zero-modification installation.
• Thermal Resistance: Specifically formulated to handle the rapid temperature fluctuations and high operation setpoints of commercial Lochinvar boilers.
• Reliable Seal: Minimizes seat cleaning time and eliminates the need for messy sealing compounds or adhesives during the inspection process.
• Industrial Durability: Resilient construction prevents pinching and deformation under the high compression loads of hand hole cover bolts.

What boiler models are compatible with the 100290345 gasket?
This part is commonly used across Lochinvar and A.O. Smith commercial water heating product lines, including several Knight boiler series and high-recovery water heaters where hand hole access is required for heat exchanger descaling.

Does this replace the old GKT1010 part number?
Yes, the 100290345 is the current manufacturer-authorized replacement for the retired GKT1010 and 100146289 part numbers. The material and dimensions remain identical to the original specifications.

Should I use a lubricant or RTV when installing this hand hole gasket?
For HVACR applications, it is standard practice to install this gasket on clean, dry surfaces. Using lubricants or adhesives can lead to gasket slippage or failure under high-pressure conditions.

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.