This Lochinvar Relief Valve is a safety device designed to control or limit the pressure in a system, preventing potential accidents caused by excessive pressure. It is constructed from high-quality materials for durability and long-lasting performance. The valve operates by releasing a substance, typically gas or liquid, from a boiler or other system when the pressure or temperature exceeds preset limits. Once the system's pressure returns to normal, the valve closes. This Lochinvar Relief Valve is compatible with various Lochinvar water heater models and has a set pressure of 30 pounds per square inch (PSI). It also features a 3/4 inch National Pipe Thread (NPT) inlet and outlet for easy installation.