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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 3/4" RPZ Principal Assembly (Top Access) ¾” 860-QT-FS RP F1312 860-QT-FS 3/4

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

    This 3/4 inch reduced pressure zone backflow preventer assembly prevents the reverse flow of high hazard (toxic) fluids found in the water from en...

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

  • Febco - LF650A-2 - 2 In Lead Free Wye Strainer, 20 Mesh Screen, Tapped 0122980 Retainer Cap, Closure Plug 0122980

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

    2 In Lead Free Wye Strainer, 20 Mesh Screen, Tapped Retainer Cap, Closure Plug Lead Free: YES This 2 inch lead free cast copper silicon alloy Y pa...

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    $ 294.70 - $ 294.70
    $ 294.70
    $ 294.70
    $ 294.70 - $ 294.70
    $ 294.70

  • Febco - LF860-QT-FS 1 1/2 - 1 1/2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor

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

    1 1/2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor Lead Free: YES T...

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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 - LF860-QT-FS 2 - 2 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor

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

    This 2 inch lead free reduced pressure zone backflow preventer assembly prevents the reverse flow of high hazard (toxic) fluids found in the water...

    View full details
    $ 1,219.36 - $ 1,219.36
    $ 1,219.36
    $ 1,567.50
    $ 1,567.50 - $ 1,567.50
    $ 1,567.50
  • 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...

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    $ 560.08 - $ 560.08
    $ 560.08
    $ 719.99
    $ 719.99 - $ 719.99
    $ 719.99
    Sold out
  • Sold out

    Febco BMS/IMS Freeze Sensor Connection Kit, For Series 765, 850, LF850 Sizes 1/2 to 2 IN

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

    Install This BMS/IMS connection kit includes a freeze sensor in mounting clip, activation module with mounting hardware, wire nuts (2), and power ...

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    $ 146.61 - $ 146.61
    $ 146.61
    $ 146.61
    $ 146.61 - $ 146.61
    $ 146.61
    Sold out

  • Febco - T765HBV 2" Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Freeze Sensor

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

    This 2 inch pressure vacuum breaker backflow preventer is used to protect against health hazard and non-hazard backsiphonage of toxic or non-toxic...

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

  • Febco 1" Pressure Vacuum Breaker 1" 765-QT-FZ T765EBV PVB Bronze Pressure Vacuum Breaker Backflow Preventer,

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

    This 1 inch pressure vacuum breaker backflow preventer is used to protect against health hazard and non-hazard backsiphonage of toxic or non-toxic...

    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.

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....

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