Watts - 1" Anti-Siphon Pressure Vacuum Breaker

The Watts Series 800M4QT Pressure Vacuum Breaker offers superior protection against back-siphonage in potable water systems. Designed for irrigation, industrial, and continuous pressure applications, this compact vacuum breaker provides reliable operation and simple maintenance for both residential and commercial installs.

Key Features:

• Prevents back-siphonage in high-risk irrigation and process water systems
• Acetal bonnet acts as a freeze plug to prevent damage in cold climates
• Replaceable plastic seat and internal components for easy servicing
• Compact, space-saving design fits tight installations
• Test cocks positioned for simple testing and winterization
• Durable bronze body with corrosion-resistant internals
• Includes tee-handle or lever handle shutoffs based on valve size

Construction & Durability:

• Bronze body construction ensures long-lasting durability
• Bonnet made from Celcon acetal for freeze resistance
• Silicone rubber seat disc and float O-ring resist heat, shock, and chemical attack
• Stainless steel springs for corrosion resistance

Performance & Functionality:

• Max operating pressure: 150 PSI
• Temperature range: 33°F to 140°F (0.5°C to 60°C)
• Meets ANSI/ASSE Standard 1020 for vacuum breaker performance
• Guided check assembly with 'V' notched guides for smooth function

Ease of Installation & Use:

• No special tools required for servicing
• Quarter-turn ball valve shutoffs on 1/2" to 1" models
• Lever handles on 1-1/4" to 2" models
• Must be installed 12" above the highest downstream outlet
• Vertical installation required with inlet on bottom

Technical Specifications:

• Operating Pressure Range: 0–150 PSI
• Temperature Range: 33°F to 140°F
• Connection Size: 1"
• Valve Body Material: Bronze
• Bonnet Material: Celcon (Acetal)
• Seat & O-Rings: Silicone Rubber
• Check Valve Seat: Noryl Plastic
• Thread Type: Female-threaded connections
• Standards Compliance: ANSI/ASSE 1020

Installation & Application:

• Recommended Uses: Residential, commercial irrigation, industrial process water systems
• Installation Method: Vertical installation 12" above highest downstream piping
• Climate Suitability: Must be protected from freezing or provide drainage/freeze protection

Compatibility & Optional Accessories:

• Compatible with insulated enclosures like WattsBox for freeze protection
• Works with standard test kits for backflow prevention inspections