This Lochinvar Main Gas Valve is a crucial component designed for the regulation of natural gas flow in various heating systems. It features a 1 1/4 inch National Pipe Thread (NPT) size, which is a standard measure for the diameter of the pipe threads. The valve is specifically engineered to control and maintain a stable gas supply, ensuring efficient operation of your heating system. It is constructed from durable materials that can withstand high pressure and temperature conditions, thereby ensuring longevity and reliable performance. The Lochinvar Main Gas Valve is compatible with specific models of boilers and water heaters that use natural gas as fuel.