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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 Water Technologies 1 in Pressure Vacuum Breaker Vent Float Kit

    Watts Water Technologies
    $ 15.99 - $ 15.99
    $ 15.99
    $ 15.99 - $ 15.99
    $ 15.99

    This 1 IN 800M4 vent repair kit provides all the parts necessary to repair the vent float of the applicable pressure vacuum breaker. This kit inclu...

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    $ 15.99 - $ 15.99
    $ 15.99
    $ 15.99 - $ 15.99
    $ 15.99

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

    Watts Water Technologies
    $ 429.97 - $ 429.97
    $ 429.97
    $ 429.97 - $ 429.97
    $ 429.97

    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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    $ 429.97 - $ 429.97
    $ 429.97
    $ 429.97 - $ 429.97
    $ 429.97

  • 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

  • Watts - 2-LF009M2-QT - Backflow System Low Pressure, 2" FIP

    Watts Water Technologies
    $ 1,111.71 - $ 1,111.71
    $ 1,111.71
    $ 1,111.71 - $ 1,111.71
    $ 1,111.71

    This 2 inch reduced pressure zone assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to...

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    $ 1,111.71 - $ 1,111.71
    $ 1,111.71
    $ 1,111.71 - $ 1,111.71
    $ 1,111.71

  • Watts - 11/2-LF009M2-QT - 1.5-LF009M2-QT Backflow System Low Pressure, 1 1/2" FIP

    Watts Water Technologies
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76

      This 1 1/2 inch reduced pressure zone assembly is designed to prevent the flow of polluted water from entering into the potable water supply...

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    $ 1,171.76 - $ 1,171.76
    $ 1,171.76
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76

  • Watts 0125572 3/4" LF25AUB-Z3 Pressure Reducing Valve (Press) Lead Free

    Watts Water Technologies
    $ 223.36 - $ 223.36
    $ 223.36
    $ 223.36 - $ 223.36
    $ 223.36

    Specs Installation   Maximum Working Pressure: 300psi (21 bar)Adjustable Reduced Pressure Range: 25 to 75psi (172 to 517 kPa)Standard Pressure ...

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    $ 223.36 - $ 223.36
    $ 223.36
    $ 223.36 - $ 223.36
    $ 223.36
  • Sold out

    Watts - 34-LF009M3-QT - Backflow System Low Pressure, 3/4" FIP

    Watts Water Technologies
    $ 483.32 - $ 483.32
    $ 483.32
    $ 483.32 - $ 483.32
    $ 483.32

    This 3/4 inch reduced pressure zone assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to...

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    $ 483.32 - $ 483.32
    $ 483.32
    $ 483.32 - $ 483.32
    $ 483.32
    Sold out

  • Watts RK 800M4-B 1 1 IN Pressure Vacuum Breaker Bonnet Assembly Kit 0887701

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 40.65
    $ 40.65 - $ 40.65
    $ 40.65

    This 1 IN 800M4 bonnet assembly repair kit provides all the parts necessary to replace the bonnet of the applicable pressure vacuum breaker. This ...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 40.65
    $ 40.65 - $ 40.65
    $ 40.65

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

    Watts Water Technologies
    $ 455.99 - $ 455.99
    $ 455.99
    $ 455.99 - $ 455.99
    $ 455.99

    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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    $ 455.99 - $ 455.99
    $ 455.99
    $ 455.99 - $ 455.99
    $ 455.99

  • Watts RK 800M4-CK 1" Repair Kit 0887704

    Watts Water Technologies
    $ 34.29 - $ 34.29
    $ 34.29
    $ 34.29 - $ 34.29
    $ 34.29

    Check Valve Repair Kit for 1" 800M4-QT / 800M4-FR Pressure Vacuum Breaker This kit contains the following: Check Spring Check Disk Holder Check Di...

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    $ 34.29 - $ 34.29
    $ 34.29
    $ 34.29 - $ 34.29
    $ 34.29

  • Watts LFFPTC-F 1/8" - 1/8 In Lead Free Full Port Test Cock 781074LL

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 19.38
    $ 19.38 - $ 19.38
    $ 19.38

    1/8 In Lead Free Full Port Test Cock 781074LL   This 1/8 IN lead free full port test cock is used for testing 1/2 to 1 inch lead free backflow pre...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 19.38
    $ 19.38 - $ 19.38
    $ 19.38

  • Watts - 0887709 - 1/2"& 3/4" Float & Vent KIT, White Repair PVB

    Watts Water Technologies
    $ 12.39 - $ 12.39
    $ 12.39
    $ 12.39 - $ 12.39
    $ 12.39

    Repair kit contains: float vent, disc assembly, seal and spring, and bonnet o-ring To repair Watts 800M4-1/2 and 3/4 vacuum breaker float vent

    $ 12.39 - $ 12.39
    $ 12.39
    $ 12.39 - $ 12.39
    $ 12.39

  • Watts LFFPTC-F 1/4" - 1/4 In Lead Free Full Port Test Cock 781075LL

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 19.38
    $ 19.38 - $ 19.38
    $ 19.38

    This 1/4 IN lead free full port test cock is used for testing 1 1/4 to 2 inch lead free backflow preventer, as an isolation valve for gauges or as...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 19.38
    $ 19.38 - $ 19.38
    $ 19.38

  • 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

  • Watts LF009M3-QT-S 3/4 3/4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer (Discontinued)

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 579.00
    $ 579.00 - $ 579.00
    $ 579.00

    3/4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer Lead Free: YES 0122695 This 3/4 i...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 579.00
    $ 579.00 - $ 579.00
    $ 579.00

  • Watts - 0887789 - 1st Check Kit for 1" RPZ

    Watts Water Technologies
    $ 80.75 - $ 80.75
    $ 80.75
    $ 80.75 - $ 80.75
    $ 80.75

     1ST CHECK ASSEMBLY REPAIR KIT

    $ 80.75 - $ 80.75
    $ 80.75
    $ 80.75 - $ 80.75
    $ 80.75

  • Watts - 1-LF800M4-QT - 1 in Bronze Anti-Siphon Pressure Vacuum Breaker, Quarter Turn Shutoff, Tee Handles 0792012

    Watts Water Technologies
    $ 360.10 - $ 360.10
    $ 360.10
    $ 360.10 - $ 360.10
    $ 360.10

    Product description Size:1" This 1 inch anti-siphon pressure vacuum breaker prevents the reverse flow of polluted water from entering into the po...

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    $ 360.10 - $ 360.10
    $ 360.10
    $ 360.10 - $ 360.10
    $ 360.10

  • Watts LFN45BM1-U-S 3/4 3/4 IN Lead Free Water Pressure Reducing Valve, Solder Union x FPT, Adjust 25-75 psi, Max Work 400 psi 0009480

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 178.98
    $ 178.98 - $ 178.98
    $ 178.98

    3/4 IN Lead Free Water Pressure Reducing Valve, Solder Union x FPT, Adjust 25-75 psi, Max Work 400 psi 0009480 Lead Free: YES   This 3/4 inch lead...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 178.98
    $ 178.98 - $ 178.98
    $ 178.98

  • Watts - 3/4-LF860-QT RP - 3/4" RPZ Lead Free 860 Series Reduced Pressure Zone Assy #0683001

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 613.12
    $ 613.12 - $ 613.12
    $ 613.12

    This 3/4 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of high hazard (toxic) fluids fo...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 613.12
    $ 613.12 - $ 613.12
    $ 613.12

  • Watts - 11/2-LF009M2-QT-S - 1 1/2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer (Discontinued)

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,413.13
    $ 1,413.13 - $ 1,413.13
    $ 1,413.13

    1 1/2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer Lead Free: YES This 1 1/2 inch ...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,413.13
    $ 1,413.13 - $ 1,413.13
    $ 1,413.13

  • 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
    $ 403.89
    $ 403.89 - $ 403.89
    $ 403.89

    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
    $ 403.89
    $ 403.89 - $ 403.89
    $ 403.89

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

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,279.56
    $ 1,279.56 - $ 1,279.56
    $ 1,279.56

    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
    $ 1,279.56
    $ 1,279.56 - $ 1,279.56
    $ 1,279.56

  • 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
    $ 170.93
    $ 170.93 - $ 170.93
    $ 170.93

    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
    $ 170.93
    $ 170.93 - $ 170.93
    $ 170.93
  • 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
    $ 171.53
    $ 171.53 - $ 171.53
    $ 171.53

    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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 171.53
    $ 171.53 - $ 171.53
    $ 171.53
    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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