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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Part number AGD4A8 from Apollo is an Agd, 8", 4a/4an Series, Abs. Typical applications span commercial mechanical systems, plumbing, and industrial processing environments. As a leader in valves and flow control, Apollo manufactures every component to exacting standards.
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Available for Purchase
Subject to factory lead times
Engineered by Apollo, the AGD4A2 is an Agd, Backflow Preventers Rp4a 2. Typical applications span commercial mechanical systems, plumbing, and industrial processing environments. Apollo products are trusted by engineers and specifiers worldwide. This product meets relevant UL and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number AGD4A6 from Apollo is an Agd, 2-1/2"-6", 4a/4an Ser. It is commonly found in fire protection, industrial processing, and HVAC applications. The AGD4A6 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves AGD4A112 is an Agd, Backflow Preventers Rp4a 1-1/4&1-1/2. This product serves professionals across marine, plumbing, and HVAC sectors. Apollo products are trusted by engineers and specifiers worldwide. This product meets relevant NSF and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the AGD4A1 is an Agd, Backflow Preventers Rp4a 1/2-1". It is commonly found in plumbing, oil and gas, and marine applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable NSF and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo AGD401 is an Agd40 Series, Rp40 3/4" & 1". Typical applications span HVAC, industrial processing, and oil and gas environments. Backed by Apollo's commitment to quality, the AGD401 is built to perform under real-world conditions. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF10G09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 10" (2 x Groove). It is commonly found in plumbing, fire protection, and marine 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 4ANLF10909 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 2-1/2" (2 x Groove). Typical applications span commercial mechanical systems, marine, and plumbing environments. Backed by Apollo's commitment to quality, the 4ANLF10909 is built to perform under real-world conditions. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10009 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 3" (2 x Groove) per the manufacturer's specifications. It is commonly found in fire protection, commercial mechanical systems, and HVAC applications. The 4ANLF10009 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable ASME and UL requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4ANLF10A09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 4" (2 x Groove) per the manufacturer's specifications. 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 FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10C09 from Apollo is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 6" (2 x Groove) per the manufacturer's specifications. Typical applications span fire protection, oil and gas, and commercial mechanical systems environments. The 4ANLF10C09 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 4ANLF10E09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 8" (2 x Groove). This product serves professionals across oil and gas, marine, and plumbing 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
Part number 4ANLF10G02 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across HVAC, fire protection, and industrial processing 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 4ANLF10H02 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in fire protection, marine, and plumbing applications. Backed by Apollo's commitment to quality, the 4ANLF10H02 is built to perform under real-world conditions. This product meets relevant NSF and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10902 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in HVAC, fire protection, and commercial mechanical systems applications. Apollo Valves is recognized globally for engineering products that meet strict performance standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10002 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, industrial processing, and fire protection environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable NSF and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10A02 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in fire protection, industrial processing, and commercial mechanical systems applications. Backed by Apollo's commitment to quality, the 4ANLF10A02 is built to perform under real-world conditions.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10C02 is a Lead Free Double Check Valve Backflow. Typical applications span commercial mechanical systems, marine, and HVAC environments. The 4ANLF10C02 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant UL and NSF standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10E02 is a Lead Free Double Check Valve Backflow. It is commonly found in HVAC, industrial processing, and oil and gas applications. Backed by Apollo's commitment to quality, the 4ANLF10E02 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
Part number 4ANLF10G03 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, industrial processing, and fire protection environments. The 4ANLF10G03 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10H03 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across oil and gas, fire protection, and industrial processing 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
Part number 4ANLF10903 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, fire protection, and commercial mechanical systems environments. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. This product meets relevant ASME and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10003 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across oil and gas, fire protection, and industrial processing sectors. Apollo Valves is recognized globally for engineering products that meet strict performance standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10A03 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, HVAC, and fire protection environments. The 4ANLF10A03 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable UL and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number AGD4A8 from Apollo is an Agd, 8", 4a/4an Series, Abs. Typical applications span commercial mechanical systems, plumbing, and industrial processing environments. 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 AGD4A2 is an Agd, Backflow Preventers Rp4a 2. Typical applications span commercial mechanical systems, plumbing, and industrial processing environments. Apollo products are trusted by engineers and specifiers worldwide. This product meets relevant UL and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number AGD4A6 from Apollo is an Agd, 2-1/2"-6", 4a/4an Ser. It is commonly found in fire protection, industrial processing, and HVAC applications. The AGD4A6 reflects Apollo's long-standing reputation for quality and innovation.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves AGD4A112 is an Agd, Backflow Preventers Rp4a 1-1/4&1-1/2. This product serves professionals across marine, plumbing, and HVAC sectors. Apollo products are trusted by engineers and specifiers worldwide. This product meets relevant NSF and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the AGD4A1 is an Agd, Backflow Preventers Rp4a 1/2-1". It is commonly found in plumbing, oil and gas, and marine applications. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. It is designed to comply with applicable NSF and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo AGD401 is an Agd40 Series, Rp40 3/4" & 1". Typical applications span HVAC, industrial processing, and oil and gas environments. Backed by Apollo's commitment to quality, the AGD401 is built to perform under real-world conditions. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo Valves 4ANLF10G09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 10" (2 x Groove). It is commonly found in plumbing, fire protection, and marine 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 4ANLF10909 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 2-1/2" (2 x Groove). Typical applications span commercial mechanical systems, marine, and plumbing environments. Backed by Apollo's commitment to quality, the 4ANLF10909 is built to perform under real-world conditions. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10009 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 3" (2 x Groove) per the manufacturer's specifications. It is commonly found in fire protection, commercial mechanical systems, and HVAC applications. The 4ANLF10009 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable ASME and UL requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Engineered by Apollo, the 4ANLF10A09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 4" (2 x Groove) per the manufacturer's specifications. 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 FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10C09 from Apollo is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 6" (2 x Groove) per the manufacturer's specifications. Typical applications span fire protection, oil and gas, and commercial mechanical systems environments. The 4ANLF10C09 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 4ANLF10E09 is a Lead Free Double Check Valve Backflow. Butterfly Shut-Off Valves, 8" (2 x Groove). This product serves professionals across oil and gas, marine, and plumbing 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
Part number 4ANLF10G02 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across HVAC, fire protection, and industrial processing 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 4ANLF10H02 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in fire protection, marine, and plumbing applications. Backed by Apollo's commitment to quality, the 4ANLF10H02 is built to perform under real-world conditions. This product meets relevant NSF and UL standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10902 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in HVAC, fire protection, and commercial mechanical systems applications. Apollo Valves is recognized globally for engineering products that meet strict performance standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10002 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, industrial processing, and fire protection environments. Apollo products are trusted by engineers and specifiers worldwide. It is designed to comply with applicable NSF and FM requirements.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10A02 from Apollo is a Lead Free Double Check Valve Backflow. It is commonly found in fire protection, industrial processing, and commercial mechanical systems applications. Backed by Apollo's commitment to quality, the 4ANLF10A02 is built to perform under real-world conditions.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10C02 is a Lead Free Double Check Valve Backflow. Typical applications span commercial mechanical systems, marine, and HVAC environments. The 4ANLF10C02 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant UL and NSF standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The Apollo 4ANLF10E02 is a Lead Free Double Check Valve Backflow. It is commonly found in HVAC, industrial processing, and oil and gas applications. Backed by Apollo's commitment to quality, the 4ANLF10E02 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
Part number 4ANLF10G03 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, industrial processing, and fire protection environments. The 4ANLF10G03 reflects Apollo's long-standing reputation for quality and innovation. This product meets relevant NSF and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10H03 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across oil and gas, fire protection, and industrial processing 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
Part number 4ANLF10903 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, fire protection, and commercial mechanical systems environments. As a leader in valves and flow control, Apollo manufactures every component to exacting standards. This product meets relevant ASME and FM standards.
Requires Quote
Available for Purchase
Subject to factory lead times
The 4ANLF10003 from Apollo is a Lead Free Double Check Valve Backflow. This product serves professionals across oil and gas, fire protection, and industrial processing sectors. Apollo Valves is recognized globally for engineering products that meet strict performance standards.
Requires Quote
Available for Purchase
Subject to factory lead times
Part number 4ANLF10A03 from Apollo is a Lead Free Double Check Valve Backflow. Typical applications span plumbing, HVAC, and fire protection environments. The 4ANLF10A03 reflects Apollo's long-standing reputation for quality and innovation. It is designed to comply with applicable UL and NSF requirements.
Requires Quote
Available for Purchase
Subject to factory lead times