Lochinvar & A.O. Smith 100076306 O-Ring

The Lochinvar & A.O. Smith 100076306 O-Ring is a critical FKM fluoroelastomer sealing component designed for high-performance commercial and residential hydronic systems. Engineered as a P14 size O-ring, this genuine OEM replacement part is specifically fabricated to withstand the demanding thermal cycles found in Lochinvar Knight boilers and A.O. Smith tankless water heaters. Using high-grade FKM (Viton) material, this seal provides superior chemical resistance and maintains its structural integrity at elevated temperatures where standard EPDM or Nitrile seals would fail. HVACR contractors rely on this 100076306 gas-fired boiler seal to prevent leaks in heat exchanger manifolds and water connections, ensuring optimal system pressure. This technical HVAC repair part is essential for maintaining the factory-specified performance and safety standards of commercial condensing units and high-efficiency water heaters. Its robust construction resists degradation from treated boiler water and common combustion byproducts, providing a reliable, long-term interface for critical mechanical junctions.

• High-Temperature Resistance: Constructed from FKM fluoroelastomer to handle the intense heat of condensing boiler environments without losing elasticity.
• Precision OEM Fit: Ensures a 100% accurate P14 seal for Lochinvar and A.O. Smith equipment, eliminating the risk of bypass leaks common with generic alternatives.
• Chemical Compatibility: Excellent resistance to mineral oils, fuels, and many aggressive fluids found in commercial mechanical rooms.
• Reduced Compression Set: Maintains a tight seal over extended operational cycles, reducing frequent maintenance intervals for high-use tankless systems.

Is the 100076306 O-ring compatible with both natural gas and propane units?
Yes, the FKM material is rated for use in various combustion environments, making it suitable for both natural gas and liquid propane commercial heaters where a P14 O-ring is specified.

Can I use an EPDM O-ring instead of this FKM version?
It is not recommended. FKM O-rings like the 100076306 are required for their superior heat and chemical resistance. Standard EPDM may degrade rapidly if exposed to the high temperatures or specific fluids present in Lochinvar Knight or A.O. Smith heat exchangers.

What is the standard application for a P14 size O-ring?
In Lochinvar and A.O. Smith systems, the 100076306 is typically used for sealing inlet/outlet water connections, flow sensor housings, and manifold components where a high-grade boiler sealing ring is mandatory.

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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.