Skip to content
Enjoy fast and free shipping on all orders over $89! Contact us (855) 424-4376
Enjoy fast and free shipping on all orders over $89! Contact us (855) 424-4376

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 - 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...

    View full details
    $ 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...

    View full details
    $ 713.36 - $ 713.36
    $ 713.36
    $ 713.36 - $ 713.36
    $ 713.36
    Sold out

  • 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...

    View full details
    $ 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...

    View full details
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76
  • Sold out

    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 ...

    View full details
    $ 223.36 - $ 223.36
    $ 223.36
    $ 223.36 - $ 223.36
    $ 223.36
    Sold out
  • 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...

    View full details
    $ 483.32 - $ 483.32
    $ 483.32
    $ 483.32 - $ 483.32
    $ 483.32
    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...

    View full details
    $ 575.13 - $ 575.13
    $ 575.13
    $ 575.13 - $ 575.13
    $ 575.13
    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...

    View full details
    $ 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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 579.00
    $ 579.00 - $ 579.00
    $ 579.00

  • 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
    $ 675.97
    $ 675.97 - $ 675.97
    $ 675.97

    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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 675.97
    $ 675.97 - $ 675.97
    $ 675.97

  • 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 ...

    View full details
    $ 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
    $ 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...

    View full details
    $ 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...

    View full details
    $ 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 ...

    View full details
    $ 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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 201.72
    $ 201.72 - $ 201.72
    $ 201.72

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.

Related Articles

Freeze Protecting Your Pressure Vacuum Breaker

Backflow prevention assemblies must be drained for the winter in areas where freezing temperatures may occur. If water inside the...

Secrets Every Sprinkler System Owner Must Know About Pressure Vacuum Breakers

This article will provide a detailed understanding of PVBs, their significance, and why you need one for your irrigation system.

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....

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare