The OBS Valve, Thermostatic Expansion, 3/4 NPT, 80 PSI from Apollo Conbraco Industries is designed for efficient temperature control in heating systems. This valve features a 3/4-inch NPT connection, ensuring compatibility with standard piping. Rated for 80 PSI, it provides reliable performance under pressure. The thermostatic expansion mechanism allows for precise temperature regulation, making it suitable for various HVAC applications. This valve is a replacement for the 78RV11780 model, ensuring continued reliability and efficiency in your systems.