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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.

  •

    Watts - LF007M3-QT-FZ - 3/4 - 3/4 In Lead Free Double Check Valve Backflow Preventer Assembly, Quarter Turn Shutoff, Single Top Entry 0063231

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 474.98
    $ 474.98 - $ 474.98
    $ 474.98

    Series LF007 Double Check Valve assemblies are installed at referenced cross-connections to prevent the backflow of polluted water into the potable...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 474.98
    $ 474.98 - $ 474.98
    $ 474.98

  • Watts -LF009M2QTFS - 1 1/2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, 1/4 Turn Shutoff Valves, Lever Handles

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,504.77
    $ 1,504.77 - $ 1,504.77
    $ 1,504.77

    This 1 1/2 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering into t...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,504.77
    $ 1,504.77 - $ 1,504.77
    $ 1,504.77
  • Sold out

    Watts LFN55BM1 U 3/4 3/4 IN Lead Free Water Pressure Reducing Valve, NPT Thread Union x NPT Female, Max Work 400 psi, Adjust 25-75 psi - 009589

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 201.01
    $ 201.01 - $ 201.01
    $ 201.01

    3/4 IN Lead Free Water Pressure Reducing Valve, NPT Thread Union x NPT Female, Max Work 400 psi, Adjust 25-75 psi 0009589 Lead Free: YES This 3/4 ...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 201.01
    $ 201.01 - $ 201.01
    $ 201.01
    Sold out

  • Watts LFN45BM1-U 3/4 3/4 IN Lead Free Water Pressure Reducing Valve, NPT Union x FPT, Adjust 25-75 psi, Max Work 400 psi 0009478

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 201.72
    $ 201.72 - $ 201.72
    $ 201.72

    3/4 IN Lead Free Water Pressure Reducing Valve, NPT Union x FPT, Adjust 25-75 psi, Max Work 400 psi 0009478 Lead Free: YES   This 3/4 inch lead fr...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 201.72
    $ 201.72 - $ 201.72
    $ 201.72
  • Sold out

    Watts - 0888521 - 2nd Check Repair Kit for 3/4 Inch Reduced Pressure Zone Assembly Series 009M3

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 36.73
    $ 36.73 - $ 36.73
    $ 36.73

    This WATTS 0888521 Second Check Repair Kit for 3/4 Inch Reduced Pressure Zone Assembly Series 009M3 is a direct replacement manufactured by Watts. ...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 36.73
    $ 36.73 - $ 36.73
    $ 36.73
    Sold out
  • Febco F1312 3/4 inch 860-QT-FS bronze RPZ backflow preventer with flood sensor

    Febco F1312 3/4 in. 860-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor

    Febco
    $ 489.99 - $ 489.99
    $ 489.99
    $ 501.09
    $ 501.09 - $ 501.09
    $ 501.09

    Febco F1312 3/4 in. 860-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F1312 Important Lead-Free Notice This product...

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    $ 489.99 - $ 489.99
    $ 489.99
    $ 501.09
    $ 501.09 - $ 501.09
    $ 501.09
  • Febco LF650A-2 2 inch wye strainer with 20 mesh screen

    Febco LF650A-2 2 in. Lead Free Wye Strainer, 20 Mesh

    Febco
    $ 294.70 - $ 294.70
    $ 294.70
    $ 294.70
    $ 294.70 - $ 294.70
    $ 294.70

    Febco LF650A-2 2 in. Lead Free Wye Strainer, 20 Mesh Brand: Febco | SKU: LF650A-2 Product Overview The Febco LF650A-2 is a 2 in. lead free Wye ...

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    $ 294.70 - $ 294.70
    $ 294.70
    $ 294.70
    $ 294.70 - $ 294.70
    $ 294.70
  • Febco F683004 LF860-QT-FS 1-1/2 inch RPZ backflow preventer with flood sensor

    Febco F683004 LF860-QT-FS 1-1/2 in. Lead Free RPZ Backflow Preventer with Flood Sensor

    Febco
    $ 1,388.29 - $ 1,388.29
    $ 1,388.29
    $ 1,388.29
    $ 1,388.29 - $ 1,388.29
    $ 1,388.29

    Febco F683004 LF860-QT-FS 1-1/2 in. Lead Free RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F683004 Product Overview The Febco F...

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    $ 1,388.29 - $ 1,388.29
    $ 1,388.29
    $ 1,388.29
    $ 1,388.29 - $ 1,388.29
    $ 1,388.29
  • Febco F683005 backflow preventer product detail
    Febco F683005 LF860-QT-FS 2 inch RPZ backflow preventer with flood sensor

    Febco F683005 LF860-QT-FS 2 in. Lead Free RPZ Backflow Preventer with Flood Sensor

    Febco
    $ 1,219.36 - $ 1,219.36
    $ 1,219.36
    $ 1,567.50
    $ 1,567.50 - $ 1,567.50
    $ 1,567.50

    Febco F683005 LF860-QT-FS 2 in. Lead Free RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F683005 Product Overview The Febco F6830...

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    $ 1,219.36 - $ 1,219.36
    $ 1,219.36
    $ 1,567.50
    $ 1,567.50 - $ 1,567.50
    $ 1,567.50
  • Febco F683002 backflow preventer product detail
    Febco F683002 LF860-QT-FS 1 inch RPZ backflow preventer with flood sensor
    Sold out

    Febco F683002 LF860-QT-FS 1 in. Lead Free RPZ Backflow Preventer with Flood Sensor

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

    Febco F683002 LF860-QT-FS 1 in. Lead Free RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F683002 Product Overview The Febco F6830...

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    $ 560.08 - $ 560.08
    $ 560.08
    $ 719.99
    $ 719.99 - $ 719.99
    $ 719.99
    Sold out
  • Febco FP-FBF-BMS-IMS-FZ BMS IMS freeze sensor connection kit
    Sold out

    Febco FP-FBF-BMS-IMS-FZ BMS/IMS Freeze Sensor Connection Kit

    Febco
    $ 146.61 - $ 146.61
    $ 146.61
    $ 146.61
    $ 146.61 - $ 146.61
    $ 146.61

    Febco FP-FBF-BMS-IMS-FZ BMS/IMS Freeze Sensor Connection Kit Brand: Febco | SKU: FP-FBF-BMS-IMS-FZ Product Overview The Febco FP-FBF-BMS-IMS-FZ...

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    $ 146.61 - $ 146.61
    $ 146.61
    $ 146.61
    $ 146.61 - $ 146.61
    $ 146.61
    Sold out
  • Febco T765HBV 2 inch bronze pressure vacuum breaker with freeze sensor

    Febco T765HBV 2 in. Bronze Pressure Vacuum Breaker with Freeze Sensor

    Febco
    $ 786.00 - $ 786.00
    $ 786.00
    $ 922.86
    $ 922.86 - $ 922.86
    $ 922.86

    Febco T765HBV 2 in. Bronze Pressure Vacuum Breaker with Freeze Sensor Brand: Febco | SKU: T765HBV Important Lead-Free Notice This product is li...

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    $ 786.00 - $ 786.00
    $ 786.00
    $ 922.86
    $ 922.86 - $ 922.86
    $ 922.86
  • Febco T765EBV 1 inch bronze pressure vacuum breaker with freeze sensor

    Febco T765EBV 1 in. Bronze Pressure Vacuum Breaker with Freeze Sensor

    Febco
    $ 136.24 - $ 136.24
    $ 136.24
    $ 244.34
    $ 244.34 - $ 244.34
    $ 244.34

    Febco T765EBV 1 in. Bronze Pressure Vacuum Breaker with Freeze Sensor Brand: Febco | SKU: T765EBV Important Lead-Free Notice This product is li...

    View full details
    $ 136.24 - $ 136.24
    $ 136.24
    $ 244.34
    $ 244.34 - $ 244.34
    $ 244.34

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

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