providing a perfect fit for models A2 through B3

reducing diagnostic time for HVACR contractors

How does the diagnostic LED assist with troubleshooting

or is it specific to newer models

Precise regulation: The black spring provides a stable 2 to 4

Lochinvar & A.O. Smith 100208451 Relief Valve 321142-301 providing a perfect fit forThe Lochinvar & A. O. Smith 100208451 Relief Valve is a critical safety component engineered for precision pressure management in high efficiency commercial boilers and water heaters. This 3 4 inch NPT relief valve is factory set to a 150 PSI relief pressure (though frequently cross referenced for 100# applications depending on system derating) and features a high capacity discharge rate to prevent catastrophic vessel failure. Built with a heavy duty