This Rheem Gas Valve is a slow-open type, designed specifically for use with natural gas (NG) systems. The valve features a 1/2 inch inlet and outlet size, which is a common standard in the industry. The slow-open mechanism of the valve ensures controlled release of gas, reducing the risk of sudden pressure surges that could potentially damage the system or cause safety issues. As an original equipment manufacturer (OEM) part from Rheem, it guarantees compatibility and reliable performance with Rheem's range of heating systems.