3/4" Brass Backflow Preventer Valve, with Vent

Watts® 3/4" Brass Dual Check Valve with Atmospheric Vent – Backflow Protection for Continuous Pressure Systems

The Watts® 3/4" Dual Check Valve with Atmospheric Vent is engineered to provide reliable backflow prevention in potable water systems. Designed for continuous pressure and non-health hazard applications, this valve features a dual check mechanism with an integrated atmospheric vent, offering an additional layer of safety against reverse flow and potential contamination.

Engineered for High-Performance Backflow Prevention

This valve is ideal for point-of-use protection in commercial and residential systems where backflow could occur due to backsiphonage or backpressure. Common installations include boiler feed lines, processing equipment, sterilizers, and similar systems where consistent water quality must be maintained. The built-in strainer and stainless steel internal components enhance long-term reliability while minimizing the need for service interruptions.

Key Features

• Brass Body Construction – Corrosion-resistant and durable for extended service life under continuous pressure.
• Stainless Steel Internal Components – Provide long-term wear resistance and mechanical integrity.
• Integral Atmospheric Vent – Vents to atmosphere during backflow, providing a visual indication of failure and added protection.
• Integrated Inlet Strainer – Captures debris and particulates, helping prevent clogging and valve malfunction.
• Dual Check Design – Offers redundancy to help ensure safe operation under varying pressure conditions.
• Compact Profile – Optimized for installation in restricted areas without sacrificing performance.
• Union Ends – Female union inlet and outlet for simplified connection, service, or replacement.
• Versatile Orientation – Approved for vertical or horizontal installations, depending on site requirements.

Technical Specifications

• Size: 3/4 inch nominal
• Body Material: Forged brass
• Internal Components: Stainless steel
• Connection Type: Female union (inlet and outlet)
• Service Type: Continuous pressure, non-health hazard
• Installation Orientation: Horizontal or vertical

Installation Considerations

Proper installation is critical to ensure this valve functions as intended. It must be installed downstream of the last shutoff valve and in accordance with local code. Ensure access for maintenance and visibility of any discharge from the atmospheric vent in case of check failure. It is recommended that a licensed plumbing professional handle the installation to maintain code compliance and performance standards.

Trusted by Plumbing Professionals

The Watts® dual check valve series is widely used in the field due to its straightforward design, durable construction, and consistent reliability. Whether used in retrofit or new installations, this model offers a compact, code-compliant solution for protecting potable water systems from backflow contamination.