Overview
The Watts Regulator 9924 ball valve is a manual quarter-turn valve suitable for residential, commercial, and industrial flow control applications. This 1-1/2″ model features NPT (National Pipe Thread) connections and is rated for 600 PSI water working pressure (WOG), making it reliable for moderate-to-high-pressure service in water, gas, and oil systems.
Key Features
- Manual lever-handle operation for simple on/off flow control
- Two-piece brass construction for durability and corrosion resistance
- Full port design minimizes pressure drop and flow restriction
- NPT threaded end connections for standard piping compatibility
- Class 600 pressure rating suitable for demanding applications
- Compact design with approximately 2″ body diameter for tight installations
Technical Specifications
- Model Number: 9924
- Nominal Size: 1-1/2 inch
- Pressure Rating: 600 PSI WOG (Water Working Operating Gauge)
- Connection Type: NPT (National Pipe Thread)
- Body Diameter: Approximately 2 inches
- Material: Brass (lead-free compliant)
- Actuation: Manual lever handle
- Port Configuration: Full port
- Configuration: Two-piece inline
- Applications: Water, gas, oil, and general industrial flow control
Typical Applications
The Watts 9924 is commonly used in:
- Water supply and irrigation systems
- Pneumatic and compressed air lines
- Hydrocarbon and liquid fuel systems
- Industrial process piping
- Building service systems and mechanical rooms
- HVAC and hydronic heating circuits
Compatibility & Replacements
Compatible With
- Standard 1-1/2″ NPT (National Pipe Thread) male fittings
- Any piping system rated for 600 PSI or less
- Water, oil, and gas service lines
- Residential and commercial plumbing systems
Replaces / Drop-In Replacement For
The Watts Regulator 9924 is a direct replacement for discontinued or worn 1-1/2″ 600WOG ball valves requiring NPT connections. Verify compatibility with your system integrator before ordering.
Works With
- Standard NPT piping and fittings (1-1/2″ male)
- Both low-pressure (water) and moderate-pressure (gas, oil) applications
- Manual control systems with no actuator requirements
- Legacy and modern plumbing installations



