A sprinkler system keeps your lawn healthy, but it can also create a serious plumbing risk if contaminated water flows backward into your clean water supply. That is why every irrigation setup should have a reliable backflow preventer for sprinkler system protection.
Whether you own a small residential sprinkler system or a large commercial irrigation setup, choosing the right backflow preventer helps protect drinking water, improve safety, and meet local plumbing codes.
In this guide from HydroSprinkler, we reviewed some of the best sprinkler backflow preventers available today based on durability, ease of installation, certifications, maintenance, and overall value.
| Image | Product | Details | Price |
|---|---|---|---|
 |
Zurn Wilkins 1-720A |
.Bronze body .Corrosion resistant .Easy installation .Certified protection |
Check Price |
 |
Watts LF007 Series |
.Freeze sensor .Lead-free body .Compact design .Easy maintenance |
Check Price |
 |
ONDAQUA 1″ Brass PVB |
.Brass construction .400 PSI support .UPC certified .DIY friendly |
Check Price |
 |
Zurn Wilkins 1-375 RPZ |
.RPZ protection .EZSwap vessel .UV resistant .High-pressure rating |
Check Price |
 |
Zurn 950XL |
.Compact size .Bronze body .Replaceable parts .Continuous-pressure use |
Check Price |
Detailed Product Reviews
1. Zurn Wilkins 1-720A 1″ Pressure Vacuum Breaker Assembly
Best Overall Backflow Preventer for Sprinkler System
The Zurn Wilkins 1-720A is one of the most trusted options for residential irrigation systems. It is designed to stop contaminated sprinkler water from flowing back into clean drinking water lines.
This model uses a pressure vacuum breaker design, which works well for most home sprinkler systems in the USA.
Key Features
- Durable bronze construction
- Corrosion-resistant body
- Certified for irrigation use
- Easy-access test cocks
- Reliable backsiphonage protection
Pros
- Trusted brand Strong long-term durability Easy maintenance
Cons
- Requires vertical installation space Not ideal for severe backpressure system
Best For
Homeowners looking for dependable residential sprinkler protection.
2. Watts LF007 Series Double-Check Valve Backflow Preventer
Best for Cold Climates
The Watts LF007 Series is designed for continuous-pressure systems and includes advanced freeze sensor technology. It is especially useful for commercial setups or properties in colder areas.
The compact modular design also makes repairs and maintenance easier than many older valve systems.
Key Features
- Freeze sensor support
- Lead-free copper silicon alloy body
- Quarter-turn shutoff valves
- Top-entry maintenance access
Pros
- Freeze sensor Lead-free body Compact design Easy maintenance
Cons
- Excellent freeze monitoring Durable construction Simple inline repairs
Best For
Commercial properties and cold-weather sprinkler systems.
3. ONDAQUA 1″ Brass Pressure Vacuum Breaker
Best Budget Backflow Preventer
If you want a lower-cost option without sacrificing essential protection, the ONDAQUA pressure vacuum breaker is a solid choice.
It offers a thick brass body, high PSI rating, and UPC certification, making it suitable for small residential irrigation systems.
Key Features
- Brass construction
- UPC certified
- 400 PSI maximum pressure
- Corrosion-resistant body
Pros
- Budget-friendly Strong pressure capacity Easy setup
Cons
- Higher cost Better for non-health hazard systems
Best For
Budget-conscious homeowners and DIY sprinkler installations.
If you enjoy DIY irrigation projects, you may also like:
4. Zurn Wilkins 1-375 Reduced Pressure Principle Backflow Preventer
Best Premium Option
The Zurn Wilkins 1-375 is a high-performance RPZ backflow preventer designed for advanced water safety protection.
Unlike standard pressure vacuum breakers, this RPZ model protects against both backsiphonage and backpressure contamination. It is commonly used in commercial irrigation and high-risk systems.
Key Features
- Reduced Pressure Zone (RPZ) protection
- EZSwap removable pressure vessel
- UV-resistant reinforced nylon components
- High-pressure rating
Pros
- Maximum water safety Great for harsh environments Commercial-grade reliability
Cons
- Expensive Professional installation recommended
Best For
Commercial irrigation systems and large residential properties. For large irrigation setups, understanding How Much Water Does a Sprinkler System Use can help reduce water waste and operating costs.
5. Zurn 950XL 1″ Double Check Backflow Preventer
Best Compact Double Check Valve
The Zurn 950XL is a compact double-check assembly designed for non-health hazard applications. It works well in areas with limited installation space.
Its replaceable internal parts also help extend the unit’s lifespan.
Key Features
- Compact bronze body
- Replaceable seats and seal rings
- Wye-pattern design
- Continuous-pressure compatibility
Pros
- Space-saving design Durable materials Long service life
Cons
- Not suitable for high-risk contamination Lower review count
Best For
Users needing a compact double check valve assembly.
Product Table
| Category | Product | Best For |
|---|---|---|
| Best Overall | Zurn Wilkins 1-720A | Most residential sprinkler systems |
| Best Budget | ONDAQUA 1″ Brass PVB | Budget-friendly irrigation protection |
| Best Premium | Zurn Wilkins 1-375 RPZ | Commercial and high-risk systems |
| Best for Cold Climates | Watts LF007 Series | Freeze monitoring and maintenance |
| Best Compact Option | Zurn 950XL | Tight installation spaces |
Buyer’s Guide
What Is a Backflow Preventer?
A backflow preventer is a plumbing device that stops dirty water from flowing backward into clean drinking water lines.
In sprinkler systems, chemicals, dirt, fertilisers, and bacteria can enter irrigation pipes. Without proper protection, this contaminated water could move back into your home’s water supply.
Types of Backflow Preventers
Pressure Vacuum Breaker (PVB)
A PVB prevents backsiphonage and is commonly used in residential sprinkler systems. These are affordable and easy to maintain.
Best For:
- Home irrigation systems
- Residential lawns
Double Check Valve Assembly (DCVA)
This type uses two internal check valves to stop reverse water flow. It works best for non-health hazard systems.
Best For:
- Commercial irrigation
- Continuous-pressure systems
Reduced Pressure Zone (RPZ)
An RPZ offers the highest level of protection against both backsiphonage and backpressure contamination.
Best For:
- Commercial properties
- High-risk irrigation systems
How to Choose the Right Backflow Preventer
1. System Size
Always match the valve size to your irrigation pipe size. Common residential sizes include 3/4-inch and 1-inch models.
2. Local Plumbing Codes
Some cities require specific types of backflow preventers. Check local regulations before purchasing.
3. Material Quality
Bronze and brass bodies usually last longer and resist corrosion better than cheaper materials.
4. Freeze Resistance
If you live in colder states, choose a model with freeze protection or winterisation support.
5. Installation Requirements
Some systems are DIY-friendly, while RPZ assemblies often require professional installation and testing.
Signs You Need a Replacement
You may need a new sprinkler backflow preventer if you notice:
- Water leakage around the valve
- Reduced sprinkler pressure
- Visible rust or corrosion
- Failed annual inspection
- Cracked valve body after winter
Installation Tips
DIY vs Professional Installation
Simple pressure vacuum breakers are easier for experienced DIY users. However, RPZ systems usually need professional installation and testing.
Maintenance Basics
- Check for leaks regularly
- Clean debris from valves
- Test annually if required by local code
Winterisation Tips
In freezing climates:
- Shut off the water supply
- Drain irrigation lines
- Insulate exposed valves
- Use compressed air if needed
Proper winterisation helps prevent cracked backflow assemblies.
FAQ
Do sprinkler systems require a backflow preventer?
Yes. Most irrigation systems require one to prevent contaminated water from entering clean drinking water supplies.
What type is best for residential irrigation?
A pressure vacuum breaker (PVB) is the most common choice for residential sprinkler systems.
How long does a backflow preventer last?
Most quality units last between 5 and 15 years depending on water quality, maintenance, and weather conditions.
Can I install one myself?
Basic PVB systems can often be installed by experienced DIY users. RPZ systems may require professional installation.
How often should a backflow preventer be tested?
Many states and municipalities require annual testing, especially for RPZ assemblies.
Final Verdict
Choosing the best backflow preventer for sprinkler system protection depends on your irrigation setup, budget, and local plumbing requirements.
For most homeowners, the Zurn Wilkins 1-720A is the best overall option because it offers strong reliability, durable construction, and easy installation at a reasonable price.
If you need advanced commercial-grade protection, the Zurn Wilkins 1-375 RPZ is the strongest premium option available.
For budget-conscious buyers, the ONDAQUA 1″ Brass Pressure Vacuum Breaker provides solid value for smaller residential systems.
No matter which model you choose, installing a proper backflow preventer is an important step toward protecting your home’s clean water supply.