Backflow Prevention
Backflow prevention devices keep contaminated water from flowing back into potable water supplies. They're required by code wherever cross-connections exist, such as boiler feeds, irrigation, fire systems and process water.
Backflow Device Types
- Reduced pressure zone (RPZ) assemblies – high-hazard protection
- Double check valve assemblies – low-hazard protection
- Pressure vacuum breakers – irrigation
- Atmospheric vacuum breakers – simple point-of-use
- Repair kits and test kits – maintenance and annual testing
Choosing a Device
The hazard level and local code determine the device. Size for flow and pressure loss, and plan for annual testing access.
Centro supplies backflow prevention devices and repair kits.
Related categories: Process Equipment | Industrial Desiccant Dehumidifiers | Heat Exchanger Applications | Thermal Fluid Heater Systems | Pumps
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Engineered by Apollo, the 4ANLF20A08 is a Reduced Pressure Principle Backflow. Typical applications span plumbing, industrial processing, and oil and gas environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. It is designed to comply with applicable NSF and ASME requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF20C03 from Apollo is a Reduced Pressure Principle Backflow. Typical applications span HVAC, plumbing, and industrial processing environments. The 4ANLF20C03 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20C08 is a Reduced Pressure Principle Backflow. This product serves professionals across plumbing, commercial mechanical systems, and fire protection sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20C07 is a Reduced Pressure Principle Backflow. Typical applications span fire protection, marine, and HVAC environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20E03 is a Reduced Pressure Principle Backflow. It is commonly found in HVAC, commercial mechanical systems, and marine applications. Backed by Apollo's commitment to quality, the 4ANLF20E03 is built to perform under real-world conditions. It is designed to comply with applicable ASME and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4ANLF20E08 is a Reduced Pressure Principle Backflow. It is commonly found in plumbing, industrial processing, and commercial mechanical systems applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable ASME and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF20G04 is a Reduced Pressure Principle Backflow. Butterfly Shut-Off Valves, 10" (Flange x Groove). It is commonly found in commercial mechanical systems, fire protection, and marine applications. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF20C04 from Apollo is a Reduced Pressure Principle Backflow. Butterfly Shut-Off Valves, 6" (Flange x Groove). It is commonly found in plumbing, fire protection, and marine applications. Backed by Apollo's commitment to quality, the 4ANLF20C04 is built to perform under real-world conditions. This product meets relevant ASME and NSF standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF21003 is a Reduced Pressure Principle Backflow. Typical applications span fire protection, industrial processing, and HVAC environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF21A03 is a Reduced Pressure Principle Backflow. It is commonly found in fire protection, HVAC, and plumbing applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF21C03 from Apollo is a Reduced Pressure Principle Backflow. Typical applications span fire protection, marine, and plumbing environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable UL and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4S10G02 is a Backflow Preventer. This product serves professionals across HVAC, industrial processing, and marine sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable ASME and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A609C6 is a DC Detector Assembly. Typical applications span HVAC, oil and gas, and marine environments. The 4A609C6 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable ASME and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A609E6 from Apollo is a DC Detector Assembly. This product serves professionals across oil and gas, plumbing, and industrial processing sectors. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A609G6 is a DC Detector Assembly. Typical applications span HVAC, plumbing, and oil and gas environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable UL and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4A609C10 from Apollo is a DC Detector Assembly. This product serves professionals across plumbing, fire protection, and industrial processing sectors. The 4A609C10 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant FM and ASME standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4A609E10 is a DC Detector Assembly. It is commonly found in oil and gas, fire protection, and marine applications. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A609G10 from Apollo is a DC Detector Assembly. Typical applications span plumbing, fire protection, and commercial mechanical systems environments. Backed by Apollo's commitment to quality, the 4A609G10 is built to perform under real-world conditions. It is designed to comply with applicable ASME and UL requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4A60AE13 from Apollo is a DC Detector Assembly. This product serves professionals across fire protection, industrial processing, and HVAC sectors. The 4A60AE13 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A60CE13 is a DC Detector Assembly. It is commonly found in HVAC, plumbing, and commercial mechanical systems applications. Backed by Apollo's commitment to quality, the 4A60CE13 is built to perform under real-world conditions. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A629C6 is a DC Detector Assembly 2nd Check. Typical applications span HVAC, industrial processing, and marine environments. The 4A629C6 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant ASME and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A629C10 is a DC Detector Assembly 2nd Check. It is commonly found in plumbing, fire protection, and commercial mechanical systems applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A629E10 is a DC Detector Assembly 2nd Check. This product serves professionals across oil and gas, marine, and commercial mechanical systems sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. This product meets relevant UL and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A629G10 from Apollo is a DC Detector Assembly 2nd Check. Typical applications span fire protection, oil and gas, and plumbing environments. The 4A629G10 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4ANLF20A08 is a Reduced Pressure Principle Backflow. Typical applications span plumbing, industrial processing, and oil and gas environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. It is designed to comply with applicable NSF and ASME requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF20C03 from Apollo is a Reduced Pressure Principle Backflow. Typical applications span HVAC, plumbing, and industrial processing environments. The 4ANLF20C03 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20C08 is a Reduced Pressure Principle Backflow. This product serves professionals across plumbing, commercial mechanical systems, and fire protection sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20C07 is a Reduced Pressure Principle Backflow. Typical applications span fire protection, marine, and HVAC environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF20E03 is a Reduced Pressure Principle Backflow. It is commonly found in HVAC, commercial mechanical systems, and marine applications. Backed by Apollo's commitment to quality, the 4ANLF20E03 is built to perform under real-world conditions. It is designed to comply with applicable ASME and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4ANLF20E08 is a Reduced Pressure Principle Backflow. It is commonly found in plumbing, industrial processing, and commercial mechanical systems applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable ASME and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF20G04 is a Reduced Pressure Principle Backflow. Butterfly Shut-Off Valves, 10" (Flange x Groove). It is commonly found in commercial mechanical systems, fire protection, and marine applications. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF20C04 from Apollo is a Reduced Pressure Principle Backflow. Butterfly Shut-Off Valves, 6" (Flange x Groove). It is commonly found in plumbing, fire protection, and marine applications. Backed by Apollo's commitment to quality, the 4ANLF20C04 is built to perform under real-world conditions. This product meets relevant ASME and NSF standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF21003 is a Reduced Pressure Principle Backflow. Typical applications span fire protection, industrial processing, and HVAC environments. Apollo Valves is recognized globally for engineering products that meet strict performance standards. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF21A03 is a Reduced Pressure Principle Backflow. It is commonly found in fire protection, HVAC, and plumbing applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF21C03 from Apollo is a Reduced Pressure Principle Backflow. Typical applications span fire protection, marine, and plumbing environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable UL and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4S10G02 is a Backflow Preventer. This product serves professionals across HVAC, industrial processing, and marine sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable ASME and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A609C6 is a DC Detector Assembly. Typical applications span HVAC, oil and gas, and marine environments. The 4A609C6 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable ASME and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A609E6 from Apollo is a DC Detector Assembly. This product serves professionals across oil and gas, plumbing, and industrial processing sectors. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A609G6 is a DC Detector Assembly. Typical applications span HVAC, plumbing, and oil and gas environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable UL and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4A609C10 from Apollo is a DC Detector Assembly. This product serves professionals across plumbing, fire protection, and industrial processing sectors. The 4A609C10 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant FM and ASME standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4A609E10 is a DC Detector Assembly. It is commonly found in oil and gas, fire protection, and marine applications. Apollo products are trusted by engineers and specifiers worldwide.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A609G10 from Apollo is a DC Detector Assembly. Typical applications span plumbing, fire protection, and commercial mechanical systems environments. Backed by Apollo's commitment to quality, the 4A609G10 is built to perform under real-world conditions. It is designed to comply with applicable ASME and UL requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4A60AE13 from Apollo is a DC Detector Assembly. This product serves professionals across fire protection, industrial processing, and HVAC sectors. The 4A60AE13 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A60CE13 is a DC Detector Assembly. It is commonly found in HVAC, plumbing, and commercial mechanical systems applications. Backed by Apollo's commitment to quality, the 4A60CE13 is built to perform under real-world conditions. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A629C6 is a DC Detector Assembly 2nd Check. Typical applications span HVAC, industrial processing, and marine environments. The 4A629C6 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant ASME and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4A629C10 is a DC Detector Assembly 2nd Check. It is commonly found in plumbing, fire protection, and commercial mechanical systems applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4A629E10 is a DC Detector Assembly 2nd Check. This product serves professionals across oil and gas, marine, and commercial mechanical systems sectors. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. This product meets relevant UL and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4A629G10 from Apollo is a DC Detector Assembly 2nd Check. Typical applications span fire protection, oil and gas, and plumbing environments. The 4A629G10 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant ASME and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times