The Maxitrol RV12-1/8 Gas Regulator with limiter is a precision gas pressure control device designed for HVAC systems. It regulates incoming gas pressure to a consistent, safe level for optimal equipment performance. The built-in limiter restricts excessive pressure, protecting downstream components. Commonly used in furnaces, unit heaters, and rooftop HVAC systems, it ensures stable fuel delivery for efficient combustion. This regulator enhances system safety, improves energy efficiency, reduces wear on components, and supports reliable, long-term operation in residential and commercial applications.