Lochinvar & A.O. Smith 100108779 Valve

The Lochinvar & A.O. Smith 100108779 Valve is a professional-grade 3" T&P Valve engineered as a critical safety component for high-capacity water heaters and heating systems. Designed specifically for 3-inch cavity residential and commercial units, this genuine OEM water heater part features a durable brass construction and a robust spring-loaded design to manage thermal expansion and system pressure. It is precision-calibrated to actuate at a 150 PSI pressure relief setting and a 210°F maximum temperature threshold, effectively preventing tank over-pressurization and potential failure.

For service technicians performing a water heater T&P valve replacement, this component ensures a precise mechanical fit for models requiring a 3-inch shank. As a primary hot water safety valve, it meets stringent standards for discharge capacity, ensuring the system can vent adequately if internal limits are reached. Maintaining the integrity of the temperature and pressure relief valve is essential for jurisdictional code compliance and the safe operation of Lochinvar and A.O. Smith boiler systems.

Key Benefits:

• System Protection: Rapidly discharges water to relieve internal force when limits are breached.
• High-Heat Tolerance: Rated for temperatures up to 210°F (99°C) for high-demand applications.
• Precision Engineering: Reliable 150 PSI relief setting prevents structural damage to the storage tank.
• Simplified Fitment: Specialized 3-inch shank length designed for deep-insulation water heater cavities.

Common Questions:

• When should a T&P valve be replaced? Technicians recommend replacement if the valve is dripping constantly, showing signs of mineral buildup (calcification), or fails a manual lift-lever test.
• Is this valve compatible with other brands? While designed for Smith and Lochinvar units, compatibility is based on the 3/4" NPT connection and the 3" shank depth required for specific jacket thicknesses.
• Does a 3-inch valve refer to the pipe size? No, the "3-inch" specification refers to the shank length needed to reach the tank through the insulation; the inlet/outlet connections are standard 3/4" NPT threads.

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.