Best Double Detector Check Valve Options for Backflow Prevention
Double detector check valves protect your water supply by preventing backflow from irrigation systems, boilers, and other non-potable uses. This guide highlights five reliable options, clarifies who each is best for, and points out practical considerations for installation and maintenance. Whether you’re a homeowner, contractor, or facility manager, these selections help you choose the right backflow prevention device for your application and local codes.
Summary at a glance: the table below lists five top picks, suitable use cases, and notable strengths. Use this as a quick reference when comparing units for installation projects or repairs.
| Product | Best For | Key Benefit |
|---|---|---|
| Zurn Wilkins 1-350 1″ 350 Double Check | Residential/Small Commercial | Rapid line flushing and offline serviceability |
| Watts 1 inch 007M1QT Double Check | Non-health hazard cross-connections | Clear guidance with local authority compliance |
| Zurn Wilkins 3/4″ 350 Double Check | Smaller plumbing circuits | Flare test fitting option |
| Zurn Wilkins 1-350XL 1″ 350XL | Compact, high-traffic backflow zones | XL variant for larger installations |
| Zurn Wilkins 1″ 950XL | Industrial or large-diameter lines | XL series with extended capacity |
Zurn Wilkins 1-350 1″ 350 Double Check Backflow Preventer
The 1-350 series is designed for reliable backflow prevention in typical residential and light commercial settings. Best for buyers needing a proven, serviceable unit with straightforward maintenance. Features include a Flush Tool (FLUSH) for quick line flushing, an EZSwap removable pressure vessel to shorten repair time, and offline serviceability to minimize downtime. This model emphasizes water savings through efficient design and easy upkeep.
Who this is best for: homeowners and small business operators seeking a dependable, easy-to-service double check valve. A key caveat is ensuring your local codes permit its 1″ connection and that maintenance tools are readily available.
Watts 1 inch 007M1QT Double Check Valve
The 007M1QT is positioned for cross-connections identified as non-health hazard applications. It is a practical choice when local inspection authorities specify specific installation requirements. This unit supports a maximum working pressure of 175 psi, which makes it suitable for standard municipal and residential water systems without extreme pressure demands.
Who this is best for: buyers needing alignment with local inspection rules and moderate-pressure applications. Considerations include confirming that the product’s installation requirements match your piping layout and permit standards.
Zurn Wilkins 3/4″ 350 Double Check with SAE Flare
This smaller-diameter model suits compact plumbing runs where space is at a premium. It includes a SAE flare test fitting for compatibility with common test equipment. Best for tight installations in residential or light commercial settings. Caution: verify that the flare connection matches your pipe size and flange tolerances before purchase.
Zurn Wilkins 1-350XL 1″ 350XL Double Check
The 350XL variant expands the 350 line, offering a robust option for larger or more demanding backflow prevention needs. It shares the 350’s core reliability while accommodating higher traffic or larger-diameter installations. Best for mid-to-large residential or light commercial setups where extra capacity is beneficial. Caution: confirm that the XL model’s connectors align with existing piping and that installation space meets the unit’s footprint.
Zurn Wilkins 1-950XL 1″ Double Check
The 950XL is designed for higher-capacity needs, suitable for industrial or large-diameter lines where backflow risk is greater. This model offers extended capacity within the XL family, making it a strong choice for more demanding systems. Choose this if you require robust performance in a busy water service line. Caution: confirm that your installation space can accommodate the larger footprint of XL-series units.
Buying Guide: Key Considerations for Double Detector Check Valves
- Local code compatibility: Always verify that the chosen valve meets your city or county backflow prevention requirements before purchasing.
- Flow and pressure ratings: Match the unit’s maximum working pressure to your system’s operating conditions to avoid failure or leakage.
- Size and footprint: Ensure adequate space for installation, service access, and potential future maintenance.
- Test fittings and accessibility: Consider models offering easy test ports or fittings for annual inspections.
- Maintenance advantages: Some units include serviceable components or offline flushing tools that shorten repair times.
- Material and corrosion resistance: For outdoor or harsh environments, select materials rated for your water chemistry and climate.
FAQ
- What is a double detector check valve used for?
It provides backflow prevention for non-potable water connections by isolating the supply from potential contaminants.
- Do these models require professional installation?
Installation often benefits from professional plumbing code adherence and testing, especially where local codes mandate inspections.
- Can I use a smaller size for a large irrigation system?
Size should match the pipe diameter and flow requirements to ensure proper protection and performance.
- What maintenance is typical for these valves?
Regular inspection, flushing, and test port checks are common; some models feature offline service or quick-release components.
- Are XL variants necessary for every project?
XL variants are suited for higher demand but require more space; smaller projects may be adequately served by standard models.
- How do I verify compliance with local regulations?
Consult your local water authority or a licensed plumber for specific permit and inspection requirements.