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Back Flows

Protect your potable water—and comply with code—by selecting the right back-flow prevention devices for your irrigation system. Our Back Flow Preventers & Parts collection offers trusted assemblies and accessories built for homeowners, DIYers, and pros alike.

Whether you’re installing a new lawn sprinkler system or upgrading an existing irrigation setup, a proper back-flow preventer is a critical safeguard. These devices stop the reversal of water flow—known as back-siphonage or back-pressure—which can draw fertilizers, soil bacteria, and other contaminants into your drinking water supply.

Shop by type

  • PVB (Pressure Vacuum Breaker): common for lawn irrigation; must be installed above grade and typically 12" above highest downstream outlet.
  • RPZ / RP (Reduced Pressure Zone): highest protection for high-hazard or fertilizer/chem injection; requires drain/relief discharge area.
  • DC / DCVA (Double Check Valve Assembly): used where allowed for low-hazard irrigation without chemicals.
  • AVB (Atmospheric Vacuum Breaker): zone-level protection; not for continuous pressure (typically one per zone where permitted).

What you'll find

  • Sizes: 3/4", 1", 1-1/2", 2" (select larger commercial sizes available)
  • Options & parts: union ball valves, test cocks, lead-free models, repair kits (bonnets, checks, relief assemblies), freeze covers
  • Brands: Febco, Watts Water, Apollo, Zurn (Wilkins)

Why choose Big Frog Supply? We focus on irrigation, plumbing and landscape lighting supplies—so you’re not just buying a part, you’re tapping into expert-curated gear, reliable inventory, and a partner who speaks “sprinkler system” language.

  •

    Apollo 4A Series Reduced Pressure Backflow Preventer | 3/4" & 1" Lead-Free Bronze

    Apollo
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99

    Apollo 4A Series (4ALF-100) Reduced Pressure Backflow Preventer Brand: Apollo (Conbraco) SKU: 4A204A2F (3/4") / 4A205A2F (1") Product Details ...

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    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99

  • Febco - 860-QT RP 100 - 1" 860 Reduced Pressure Zone Assembly

    Febco
    $ 206.18 - $ 206.18
    $ 206.18
    $ 593.68
    $ 593.68 - $ 593.68
    $ 593.68

    Spec Sheet Freeze Prevention Maintenance   The FEBCO Series 860 Reduced Pressure Zone Assemblies are for use in health-hazard applications. The s...

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    $ 206.18 - $ 206.18
    $ 206.18
    $ 593.68
    $ 593.68 - $ 593.68
    $ 593.68

  • Watts - LF25AUB-Z3 - Water Pressure Reducing Valve 1 Inch Pipe Size 0009309

    Watts Water Technologies
    $ 505.65 - $ 505.65
    $ 505.65
    $ 505.65 - $ 505.65
    $ 505.65

    Spec Sheet Pressure reducing valves are usually installed in front of piping to help maintain pressure throughout your home. Watts Water Pressure R...

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    $ 505.65 - $ 505.65
    $ 505.65
    $ 505.65 - $ 505.65
    $ 505.65
  • Sold out

    Watts - 1-LF009M2-QT - Backflow System Low Pressure, 1" FIP 0391004

    Watts Water Technologies
    $ 713.36 - $ 713.36
    $ 713.36
    $ 713.36 - $ 713.36
    $ 713.36

    This 1 inch Lead Free reduced pressure zone assembly is designed to prevent the backflow of polluted water from entering into the potable water su...

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    $ 713.36 - $ 713.36
    $ 713.36
    $ 713.36 - $ 713.36
    $ 713.36
    Sold out
  • Sold out

    Watts - 1-LF007M1-QT - 1 inch LF007M1-QT 1 Double Check Valve 0063232

    Watts Water Technologies
    $ 575.13 - $ 575.13
    $ 575.13
    $ 575.13 - $ 575.13
    $ 575.13

    This 1 inch lead free double check valve backflow preventer assembly is designed to prevent the backflow of polluted water from entering into the p...

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    $ 575.13 - $ 575.13
    $ 575.13
    $ 575.13 - $ 575.13
    $ 575.13
    Sold out

  • Febco 1" RPZ Principal Assembly (Top Access) 1" 860-QT-FS RP F1313

    Febco
    $ 525.99 - $ 525.99
    $ 525.99
    $ 588.06
    $ 588.06 - $ 588.06
    $ 588.06

    This 1 inch reduced pressure zone backflow preventer assembly prevents the reverse flow of high hazard (toxic) fluids found in the water from ente...

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    $ 525.99 - $ 525.99
    $ 525.99
    $ 588.06
    $ 588.06 - $ 588.06
    $ 588.06

  • Zurn Wilkins 1-975XL 1" 975XL Reduced Pressure Principle Assembly

    Zurn Wilkins
    $ 816.99 - $ 816.99
    $ 816.99
    $ 816.99 - $ 816.99
    $ 816.99

    The 975XL Reduced Pressure Principle Backflow Assembly is used on non-potable water applications for high health hazard protection from both backsi...

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    $ 816.99 - $ 816.99
    $ 816.99
    $ 816.99 - $ 816.99
    $ 816.99
  • Sold out

    Zurn Wilkins 1-975XLS 1" 975XL Reduced Pressure Assembly w/ Bronze Wye Strainer (Discontinued)

    Zurn Wilkins
    $ 947.99 - $ 947.99
    $ 947.99
    $ 947.99 - $ 947.99
    $ 947.99

    The Zurn Wilkins 975XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for non-potable water applications. The wye p...

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    $ 947.99 - $ 947.99
    $ 947.99
    $ 947.99 - $ 947.99
    $ 947.99
    Sold out

  • Zurn 1-975XL3 1" Reduced Pressure Principle Backflow Preventer

    Zurn Wilkins
    $ 0.00 - $ 0.00
    $ 0.00
    $ 983.99
    $ 983.99 - $ 983.99
    $ 983.99

    The Zurn Wilkins 975XL3 Reduced Pressure Principle Backflow Assembly provides high hazard protection against backsiphonage and backpressure in pota...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 983.99
    $ 983.99 - $ 983.99
    $ 983.99

  • Zurn 1" 375 RP Ball Vlv NPT Top Access Lead Free Red Pressure Principle Backflow Preventer

    Zurn Wilkins
    $ 0.00 - $ 0.00
    $ 0.00
    $ 983.99
    $ 983.99 - $ 983.99
    $ 983.99

    The Zurn Wilkins 375XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable water applications. The EZSwap Pr...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 983.99
    $ 983.99 - $ 983.99
    $ 983.99
  • Sold out

    Zurn 1-975XL2 1" Reduced Pressure Principle Backflow Preventer No Lead

    Zurn Wilkins
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,139.99
    $ 1,139.99 - $ 1,139.99
    $ 1,139.99

    The 975XL2 Reduced Pressure Principle Assembly is used in high health hazard, potable water applications for protection from both backsiphonage and...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,139.99
    $ 1,139.99 - $ 1,139.99
    $ 1,139.99
    Sold out
  • Sold out

    Zurn Wilkins 1-NR3XLDUC 1" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Connection

    Zurn Wilkins
    $ 279.99 - $ 279.99
    $ 279.99
    $ 279.99 - $ 279.99
    $ 279.99

    Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...

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    $ 279.99 - $ 279.99
    $ 279.99
    $ 279.99 - $ 279.99
    $ 279.99
    Sold out
  • Sold out

    Zurn Wilkins 1-NR3XLDU 1 in. NR3XL Pressure Reducing Valve, Double Union FNPT Connections

    Zurn Wilkins
    $ 279.99 - $ 279.99
    $ 279.99
    $ 279.99 - $ 279.99
    $ 279.99

    Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...

    View full details
    $ 279.99 - $ 279.99
    $ 279.99
    $ 279.99 - $ 279.99
    $ 279.99
    Sold out
  • Sold out

    Zurn Wilkins 1-70XLDU 1" Pressure Reducing Valve w/ FNPT Double Union Connections

    Zurn Wilkins
    $ 298.99 - $ 298.99
    $ 298.99
    $ 298.99 - $ 298.99
    $ 298.99

    The model 70XL has been providing residential and commercial customers with ruggedness and ease of repair for over 40 years. Ideal for use where Le...

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    $ 298.99 - $ 298.99
    $ 298.99
    $ 298.99 - $ 298.99
    $ 298.99
    Sold out
  • Sold out

    Zurn Wilkins 1-600XL 1" Lead Free FNPT Union x FNPT Pressure Reducing Valve

    Zurn Wilkins
    $ 483.99 - $ 483.99
    $ 483.99
    $ 483.99 - $ 483.99
    $ 483.99

    Zurn Wilkins Model 34-600XL 1" Water Pressure Reducing Brass Valve with Integral By-pass Check Valve and Strainer, FNPT Union x FNPT, Lead Free   ...

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    $ 483.99 - $ 483.99
    $ 483.99
    $ 483.99 - $ 483.99
    $ 483.99
    Sold out
  • Sold out

    Zurn Wilkins 1-NR3XL 1" NR3 Water Pressure Reducing Valve

    Zurn Wilkins
    $ 274.99 - $ 274.99
    $ 274.99
    $ 274.99 - $ 274.99
    $ 274.99

    The NR3XL Pressure Reducing Valve provides reliable pressure reduction for residential applications, and is available with a variety of end connec...

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    $ 274.99 - $ 274.99
    $ 274.99
    $ 274.99 - $ 274.99
    $ 274.99
    Sold out

  • Watts RK 009M2-CK2 1 1 IN Reduced Pressure Zone Assembly Backflow Repair Kit, Second Check Kit, for 009M2 0887790

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 73.60
    $ 73.60 - $ 73.60
    $ 73.60

    This 1 IN 009M2 second check repair kit provides all the parts necessary to replace the major internal components of the applicable reduced pressu...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 73.60
    $ 73.60 - $ 73.60
    $ 73.60
  • Sold out

    Febco - LF860-QT-FS 1 - 1 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor

    Febco
    $ 560.08 - $ 560.08
    $ 560.08
    $ 719.99
    $ 719.99 - $ 719.99
    $ 719.99

    1 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor  Lead Free: YES This...

    View full details
    $ 560.08 - $ 560.08
    $ 560.08
    $ 719.99
    $ 719.99 - $ 719.99
    $ 719.99
    Sold out

Before installing, check your local water-utility or code requirements—many jurisdictions mandate annual testing or specific assembly types based on flow, hazard level or chemical injection. Choose the correct device, install it properly (above grade or per elevation specs), and test or maintain it regularly to ensure protection long-term.

Browse through the collection to find the right size, type and brand for your project—then install with confidence knowing your potable supply is locked down.

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The difference between a Pressure Vacuum Breaker and a Reduced Pressure Zone

When it comes to protecting a plumbing system from backflow, there are different types of devices that can be installed....

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