Brass shut-off valves on a water-supply line

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Backflow Preventers

Sprinkler and irrigation backflow preventers keep lawn water from siphoning back into your drinking supply. Shop pressure vacuum breakers, reduced-pressure assemblies, and double-check valves from Febco, Watts, and Apollo, shipped fast from a nationwide warehouse network.

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Every sprinkler or irrigation system tied to a city water line needs a backflow preventer. Total Sprinkler stocks every type: pressure vacuum breakers, reduced-pressure (RPZ) assemblies, and double-check valves, in residential and commercial sizes. Choose by hazard level and local code, or talk to a specialist if you are not sure.

Shop Backflow Preventers by Type

Pressure Vacuum BreakersMost common for irrigation Reduced-Pressure (RP) AssembliesHighest-hazard protection Double-Check AssembliesLow-hazard backflow Replacement PartsRebuild kits & spares Freeze Protection BagsInsulate exposed assemblies

Backflow Preventers

Backflow Preventers

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Apollo 4A105A2F
1" Model 4A105A2F Double Check Valve
<p>The Apollo® Model 4A105A2F Series Double Check Valves prevent contamination of the potable water supply due to back-siphonage or backpressure from substances that are objectionable to the potable water supply, but non-health hazards. The top accessed modular check valve cartridges provide captured springs, replaceable seats and reversible silicone seat discs. This Made in America assembly features ball valve shutoffs with stainless steel handles and nuts as standard and carries the five-year Apollo® factory warranty.</p><p></p><p><strong>THIS IS NOT THE LEAD-FREE MODEL </strong></p>
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Apollo 4A104A2F
3/4" Model DC4A Double Check Valve
<ul><li><p>3/4" Model DC4A Double Check Valve</p></li><li><p>4A104A2F</p></li><li><p><strong>NOT LEAD-FREE</strong></p></li></ul><p></p><p>The Apollo® Model DC4A Double Check Valves prevent contamination of the potable water supply due to back-siphonage or backpressure from substances that are objectionable to the potable water supply, but non-health hazards. The top accessed modular check valve cartridges provide captured springs, replaceable seats and reversible silicone seat discs. This Made in America assembly features ball valve shutoffs with stainless steel handles and nuts as standard and carries the five-year Apollo® factory warranty.</p><p></p><p><strong>THIS IS NOT THE LEAD-FREE MODEL </strong></p>
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Febco T765DBV
765DBV, 3/4 in. Vacuum Breaker Backflow Preventer 765 Series (765-QT PVB 3/4)
<p>Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against back siphonage of toxic or non-toxic liquids. They feature a durable bronze body and a check valve and air opening port in one assembly. Maximum Working Pressure: 150 psi (10.3 bar).</p><p></p><p><strong>Features</strong></p><ul><li><p>All bronze body for durability. One check valve and an air opening port in one assembly</p></li><li><p>Lightweight poppet seals air opening under minimum flow conditions</p></li><li><p>Designed for minimum head loss</p></li><li><p>Simple service procedures. All internal parts serviceable in line from the top of the unit</p></li></ul>
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Apollo 4A205A2F
1" Model RP4A Series Reduced Pressure Backflow Preventer/4A-200 Series
<ul><li><p>1" Model RP4A Series Reduced Pressure Backflow Preventer/4A-200 Series</p></li><li><p>4A205A2F</p></li><li><p>THIS IS <strong>NOT</strong> THE LEAD-FREE MODEL </p></li></ul><p></p><p>The Apollo® model RP4A series reduced pressure backflow preventers provide maximum protection against backsiphonage or backpressure from substances that are hazardous to the potable water supply. the top accessed modular check valve cartridges provide captured springs, replaceable seats and reversible silicone seat discs. this made in America assembly features ball valves with stainless steel handles and trim as standard and carries the five-year Apollo® factory warranty.</p>
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Apollo 4ALF205A2F
1" Bronze FPT RP4A Series LF Backflow Preventer
<ul><li><p>Apollo 4ALF205A2F</p></li><li><p><strong>THIS MODEL IS LEAD-FREE</strong></p></li></ul><p></p><p>The Apollo® model RPLF4A lead free series reduced pressure backflow preventers provide maximum protection against backsiphonage or backpressure from substances that are hazardous to the potable water supply.</p><p>The top accessed modular check valve cartridges provide captured springs, replaceable seats and reversible silicone seat discs.</p><p>This made in America assembly features ball valves with stainless steel handles and trim as standard and carries the five-year Apollo® factory warranty. </p>
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Apollo 4A505A2F
1'' Model PVB4A Pressure Vacuum Breaker /PVB 4A Series
<p>The Apollo® Model PVB4A and PVBLF4A Pressure Vacuum Breaker A Series prevents contamination of the potable water supply due to back-siphonage. A standard integral freeze protection relief valve serves to reduce the possibility of damage due to intermittent freezing conditions. The modular check valve cartridge provides a captured spring, a replaceable seat, and a reversible silicone seat disc. This assembly features ball valve shutoffs with stainless steel handles and nuts as standard.</p>
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Febco T1113
1" Double Check Valve Assembly 850 Small (850-QT 1)
<p>The FEBCO Series 850 Double Check Valve Assembly Backflow Preventers are designed for non-health hazard applications. The Series 850 are designed to protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connections: NPT ANSI / ASME B1.20.1.</p>
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Febco F1313
1" Reduced Pressure Zone Assembly 860 Small (860-QT 1)
<p>The FEBCO Series 860 Small Reduced Pressure Zone assemblies are for use in health-hazard applications. The series 860 protects drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connection specified NPT ANSI / ASME B1.20.1.</p><p></p><p><strong>Features</strong></p><ul><li><p>Suitable for use in industrial plants, hospitals, morgues, mortuaries, chemical plants, irrigation systems, boiler feed, and water lines</p></li><li><p>Primarily application for potable drinking water systems where code mandates protection from backpressure and backsiphonage conditions</p></li><li><p>In-line serviceable assembly requiring no special tools</p></li><li><p>Protects potable water against cross-connection contamination with high hazard (toxic) fluids in water services</p></li></ul>
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Febco T1112
.75" Double Check Valve Assembly 850 Small (850-QT 3/4)
<p>The FEBCO Series 850 Double Check Valve Assembly Backflow Preventers are designed for non-health hazard applications. The Series 850 are designed to protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connections: NPT ANSI / ASME B1.20.1.</p>
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Febco T1115
1115, 1.5" Double Check Valve Assembly 850 Small (850-QT 1 1/2)
<p>The FEBCO Series 850 Double Check Valve Assembly Backflow Preventers are designed for non-health hazard applications. The Series 850 are designed to protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connections: NPT ANSI / ASME B1.20.1.</p>
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Febco 765DUB
765DUB, U765-QT 3/4 Inch Bronze Pressure Vacuum Breaker Backflow Preventer
<ul><li><p>Febco 765DUB</p></li><li><p>U765-QT 3/4</p></li><li><p>3/4 Inch Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Union Connections</p></li></ul>
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Febco F1316
2" 860 Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn
<p>The FEBCO Series 860 Small Reduced Pressure Zone assemblies are for use in health-hazard applications. The series 860 protects drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connection specified NPT ANSI / ASME B1.20.1.</p><p></p><p><strong>Features</strong></p><ul><li><p>Suitable for use in industrial plants, hospitals, morgues, mortuaries, chemical plants, irrigation systems, boiler feed, and water lines</p></li><li><p>Primarily application for potable drinking water systems where code mandates protection from backpressure and backsiphonage conditions</p></li><li><p>In-line serviceable assembly requiring no special tools</p></li><li><p>Protects potable water against cross-connection contamination with high hazard (toxic) fluids in water services</p></li></ul>
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Febco T765GBV
1 1/2" 765 Pressure Vacuum Breaker Backflow Preventer, Q-Turn, Freeze Sensor
<p>Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against back siphonage of toxic or non-toxic liquids. They feature a durable bronze body and a check valve and air opening port in one assembly. Maximum Working Pressure: 150 psi (10.3 bar).</p><p></p><p><strong>Features</strong></p><ul><li><p>All bronze body for durability. One check valve and an air opening port in one assembly</p></li><li><p>Lightweight poppet seals air opening under minimum flow conditions</p></li><li><p>Designed for minimum head loss</p></li><li><p>Simple service procedures. All internal parts serviceable in line from the top of the unit</p></li></ul>
Out of stock
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Febco F1312
3/4" 860 Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff
<p>The FEBCO Series 860 Small Reduced Pressure Zone assemblies are for use in health-hazard applications. The series 860 protects drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. Small diameter sizes 1/2 to 2 inch. Standard assembly with ball valves or union end ball valves. End Connection specified NPT ANSI / ASME B1.20.1.</p><p></p><p><strong>Features</strong></p><ul><li><p>Suitable for use in industrial plants, hospitals, morgues, mortuaries, chemical plants, irrigation systems, boiler feed, and water lines</p></li><li><p>Primarily application for potable drinking water systems where code mandates protection from backpressure and backsiphonage conditions</p></li><li><p>In-line serviceable assembly requiring no special tools</p></li><li><p>Protects potable water against cross-connection contamination with high hazard (toxic) fluids in water services</p></li></ul><h2 style="text-align: start"></h2>
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Febco 0122965
0122965 LF850U-QT 1 Inch Lead Free Bronze Double Check Valve Backflow Preventer Assembly
<ul><li><p>Febco 0122965</p></li><li><p>LF850U-QT 1</p></li><li><p>1 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Union, Small Diameter</p></li></ul>
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Febco 0683043
LF850-QT 2, 2 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly
<ul><li><p>Febco 0683043</p></li><li><p>LF850-QT 2</p></li><li><p>2 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter</p></li></ul>
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Febco 0683042
LF850-QT 1 1/2 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly
<ul><li><p>Febco 0683042</p></li><li><p>LF850-QT 1 1/2</p></li><li><p>1 1/2 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter</p></li></ul>
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Apollo 4ALF104A2F
3/4" 4A Lead-Free Double Check Backflow Valve, 4ALF104A2F
<p>The Apollo 4ALF104A2F is a 3/4-inch lead-free DCLF 4A double check valve assembly for backflow prevention on potable-water irrigation systems. The lead-free (LF) construction meets code requirements for potable plumbing where lead-bearing brass is no longer permitted.</p><ul><li>3/4-inch DCLF 4A double check valve, lead-free</li><li>Backflow prevention for potable-water irrigation</li><li>Meets lead-free code requirements (NSF/ANSI 372)</li><li>Genuine Apollo backflow assembly</li></ul><p>In stock and ships fast from Total Sprinkler.</p>
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Febco 0683040
0683040 LF850-QT 1 Inch Lead Free Bronze Double Check Valve Backflow Preventer Assembly
<ul><li><p>Febco 0683040</p></li><li><p>LF850-QT 1</p></li><li><p>1 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter</p></li></ul>
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Febco 0683039
0683039 LF850-QT 3/4 Inch Lead Free Bronze Double Check Valve Backflow Preventer Assembly
<ul><li><p>Febco 0683039</p></li><li><p>LF850-QT 3/4</p></li><li><p>3/4 In Lead Free Bronze Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter</p></li></ul>
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Backflow Preventer FAQ

What is a backflow preventer?

A backflow preventer is a valve assembly on the main irrigation line that stops used or contaminated water from flowing backward into the clean water supply. When city pressure drops, it keeps lawn water, fertilizer, and pesticide out of your drinking water.

Do I need a backflow preventer for my sprinkler system?

Most local codes require one so irrigation water cannot siphon back into your drinking supply. The required type and size depend on your code and the hazard level. Confirm with your local water authority before you buy.

PVB or RP: which do I need?

A pressure vacuum breaker is the most common choice for typical residential irrigation and must sit at least 12 inches above the highest head. A reduced-pressure (RP) assembly offers the highest protection for high-hazard connections and anywhere back-pressure is possible. Your local code sets the requirement.

How do I keep a backflow preventer from freezing?

In freezing climates, shut off and drain the assembly before winter, or wrap it in an insulated freeze bag. The exposed brass body and test cocks are the first parts to crack.

Does a backflow preventer have to be tested?

Many jurisdictions require testable assemblies to be tested by a certified tester at installation and then annually. Check your local water authority’s rule.

What size backflow preventer do I need?

Match the assembly to your service or mainline size. That is commonly 3/4 in or 1 in for residential irrigation. Sizing larger than the line adds cost without adding flow.

How is a backflow preventer installed?

It installs on the main line, upstream of the zone valves. A pressure vacuum breaker sits at least 12 inches above the highest head; a reduced-pressure assembly mounts above grade with clearance for its relief drain. Many areas require a licensed installer and a certified test after install.

Shop Backflow by Brand

FebcoPVB & RP irrigation assemblies WattsRP, PVB & double-check valves ApolloBackflow preventers & ball valves

How to Choose a Backflow Preventer

The right assembly depends on your hazard level and local code. The four common types:

Atmospheric vacuum breaker (AVB). The simplest and cheapest. Mount it at least 6 inches above the highest outlet. It cannot stay under constant pressure or have a downstream shut-off, so it does not fit most multi-zone systems.
Pressure vacuum breaker (PVB). The usual pick for residential irrigation. It holds constant pressure. Install it at least 12 inches above the highest head. It stops back-siphonage but not back-pressure.
Reduced-pressure (RP / RPZ). The highest level of protection. Use it for high-hazard connections and anywhere back-pressure is possible.
Double-check assembly. For low-hazard backflow only.

Confirm the required type, size, and testing rules with your local water authority before you buy. Servicing an existing unit? We stock relief valves and replacement parts.

In freezing climates, drain the assembly or wrap it in an insulated freeze bag before winter. The exposed brass body and test cocks crack first. A backflow preventer mounts upstream of the valve manifold. To size the box that protects it, see our How to Choose a Sprinkler Valve Box guide.

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