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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.

  • Sold out

    Apollo - Bronze FIP Pressure Vacuum Breaker 4A Series A2F

    Apollo
    $ 104.02 - $ 104.95
    $ 104.02 - $ 104.95
    $ 104.02 - $ 104.95
    $ 104.02

    This vacuum breaker prevents contamination of the potable water due to back siphon-age. A integrated freeze protection relief valve serves to reduc...

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    $ 104.02 - $ 104.95
    $ 104.02 - $ 104.95
    $ 104.02 - $ 104.95
    $ 104.02
    Sold out
  • Sold out

    Febco - 765-QT75 - 3/4 in. 765 Backflow Preventer

    Febco
    $ 116.62 - $ 116.62
    $ 116.62
    $ 116.62 - $ 116.62
    $ 116.62

    Spec Sheet   Install Manual New Version Series 765 Pressure Vacuum Breakers Size: 1/2" - 2" (15mm - 50mm) The FEBCO Series 765 Pressure Vacuum ...

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    $ 116.62 - $ 116.62
    $ 116.62
    $ 116.62 - $ 116.62
    $ 116.62
    Sold out
  • Sold out

    Apollo - 4A204A4F - 3/4 in. Bronze FIP Reduced Pressure Backflow Preventer with Union Shut-Off Valves

    Apollo
    $ 323.85 - $ 323.85
    $ 323.85
    $ 323.85 - $ 323.85
    $ 323.85

    This item with threaded connections is designed to prevent the back flow of polluted water from entering into the potable water supply due to back ...

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    $ 323.85 - $ 323.85
    $ 323.85
    $ 323.85 - $ 323.85
    $ 323.85
    Sold out
  • Sold out

    Apollo - Backflow Preventer, Reduced Pressure, Bronze with Ball Valves and SAE Test Cocks

    Apollo
    $ 274.00 - $ 327.14
    $ 274.00 - $ 327.14
    $ 274.00 - $ 327.14
    $ 274.00

    This vacuum breaker prevents contamination of the potable water due to back siphon-age. A integrated freeze protection relief valve serves to reduc...

    View full details
    $ 274.00 - $ 327.14
    $ 274.00 - $ 327.14
    $ 274.00 - $ 327.14
    $ 274.00
    Sold out

  • 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 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
  • Sold out

    Febco - 765EUB-100 - 765 1" Watts Pressure Vacuum Breaker w/ Union Connections

    Febco
    $ 210.00
    $ 210.00 - $ 210.00
    $ 210.00
    $ 199.99
    $ 199.99 - $ 199.99
    $ 199.99

    Spec Sheet Install Manual New Version   Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against back si...

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    $ 210.00
    $ 210.00 - $ 210.00
    $ 210.00
    $ 199.99
    $ 199.99 - $ 199.99
    $ 199.99
    Sold out

  • 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

  • Febco - 905211 - Bonnet Repair Kit for 765 Pressure Vacuum Breakers and Backflow Preventers, 1/2 Inch and 3/4 Inch

    Febco
    $ 36.41 - $ 36.41
    $ 36.41
    $ 36.41 - $ 36.41
    $ 36.41

    This Febco 905211 Bonnet Repair Kit is designed for 765 Pressure Vacuum Breakers and Backflow Preventers, with sizes of 1/2” and 3/4”. This kit con...

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    $ 36.41 - $ 36.41
    $ 36.41
    $ 36.41 - $ 36.41
    $ 36.41
  • 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

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

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

    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
    $ 525.99
    $ 525.99 - $ 525.99
    $ 525.99

  • Febco -F1314 - 1 1/4 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly with Quarter Turn Shutoff, Small Diameter & Flood Sensor 860-QT-RP-FS

    Febco
    $ 0.00 - $ 0.00
    $ 0.00
    $ 885.90
    $ 885.90 - $ 885.90
    $ 885.90

    This 1 1/4 inch reduced pressure zone backflow preventer assembly prevents the reverse flow of high hazard (toxic) fluids found in the water from e...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 885.90
    $ 885.90 - $ 885.90
    $ 885.90

  • Febco - 860-QT-FS 2 - 2 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor F1316

    Febco
    $ 1.00 - $ 1.00
    $ 1.00
    $ 1,391.24
    $ 1,391.24 - $ 1,391.24
    $ 1,391.24

    2 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Small Diameter, Backflow Flood Sensor  This item does not comp...

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    $ 1.00 - $ 1.00
    $ 1.00
    $ 1,391.24
    $ 1,391.24 - $ 1,391.24
    $ 1,391.24

  • Febco - 860U-QT-FS 3/4 - 3/4 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Union Ball Valves, Small Diameter, Backflow Flood Sensor

    Febco
    $ 0.00 - $ 0.00
    $ 0.00
    $ 464.97
    $ 464.97 - $ 464.97
    $ 464.97

    3/4 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff, Union Ball Valves, Small Diameter, Backflow Flood Sensor Thi...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 464.97
    $ 464.97 - $ 464.97
    $ 464.97
  • Sold out

    Febco - T765FBV 1 1/4 IN Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Freeze Sensor

    Febco
    $ 653.33 - $ 653.33
    $ 653.33
    $ 653.33
    $ 653.33 - $ 653.33
    $ 653.33

    This 1 1/4 inch pressure vacuum breaker backflow preventer is used to protect against health hazard and non-hazard backsiphonage of toxic or non-t...

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    $ 653.33 - $ 653.33
    $ 653.33
    $ 653.33
    $ 653.33 - $ 653.33
    $ 653.33
    Sold out

  • Febco 11/2" Pressure Vacuum Breaker 765-QT-FZ PVB 1 1/2 Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Freeze Sensor

    Febco
    $ 733.23 - $ 733.23
    $ 733.23
    $ 733.23
    $ 733.23 - $ 733.23
    $ 733.23

    This 1 1/2 inch pressure vacuum breaker backflow preventer is used to protect against health hazard and non-hazard backsiphonage of toxic or non-t...

    View full details
    $ 733.23 - $ 733.23
    $ 733.23
    $ 733.23
    $ 733.23 - $ 733.23
    $ 733.23

  • Febco U765-QT-FZ PVB 1 1 IN Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Unions

    Febco
    $ 217.32 - $ 217.32
    $ 217.32
    $ 217.32
    $ 217.32 - $ 217.32
    $ 217.32

    Lead Free: NO 1 IN Bronze Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoffs, Union Connections, Freeze Sensor   This 1 inch pressu...

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    $ 217.32 - $ 217.32
    $ 217.32
    $ 217.32
    $ 217.32 - $ 217.32
    $ 217.32

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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