Automatic Fill Valve Adjustable 1/2 Inch NPT Set at 15 PSI

The Automatic Fill Valve Adjustable 1/2 Inch NPT Set at 15 PSI (CAL-553542A) provides automatic make-up water control for hydronic systems using a 1/2 inch NPT connection and an adjustable pressure regulator factory-set at 15 PSI. This valve includes an internal diaphragm-regulated cartridge, adjustable pressure mechanism, and brass body designed for stable hydronic pressure control. For job fit, technicians must verify the hydronic system requires a 15 PSI default fill pressure, confirm piping is 1/2 inch NPT, and ensure the adjustment range accommodates the system’s operating pressure needs. Installed correctly, the valve maintains steady system pressure and reduces manual intervention during system charging.