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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

    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

  • 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

    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...

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    $ 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

  • Zurn Wilkins 34-720A 3/4 Inch Pressure Vacuum Breaker Assembly

    Zurn Wilkins
    $ 0.00 - $ 0.00
    $ 0.00
    $ 147.99
    $ 147.99 - $ 147.99
    $ 147.99

    Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 147.99
    $ 147.99 - $ 147.99
    $ 147.99
  • Sold out

    Zurn Wilkins 12-720A 1/2" 720A Pressure Vacuum Breaker Assembly

    Zurn Wilkins
    $ 159.99 - $ 159.99
    $ 159.99
    $ 159.99 - $ 159.99
    $ 159.99

    Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...

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    $ 159.99 - $ 159.99
    $ 159.99
    $ 159.99 - $ 159.99
    $ 159.99
    Sold out
  • Sold out

    Zurn Wilkins 112-720A 1-1/2" 720A Pressure Vacuum Breaker Assembly

    Zurn Wilkins
    $ 795.99 - $ 795.99
    $ 795.99
    $ 795.99 - $ 795.99
    $ 795.99

    Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...

    View full details
    $ 795.99 - $ 795.99
    $ 795.99
    $ 795.99 - $ 795.99
    $ 795.99
    Sold out
  • Sold out

    Zurn Wilkins RK1-720A 1/2" - 2" Pressure Vacuum Breaker Repair Kit

    Zurn Wilkins
    $ 74.99 - $ 74.99
    $ 74.99
    $ 74.99 - $ 74.99
    $ 74.99

    Complete repair kit for the 720A Pressure Vacuum Breaker. Kits fits the 1/2" - 2" models of the Wilkins 720A Includes poppet assembly, spider asse...

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    $ 74.99 - $ 74.99
    $ 74.99
    $ 74.99 - $ 74.99
    $ 74.99
    Sold out
  • Sold out

    Zurn Wilkins 114-720A 720A 1.25 inch PVB Backflow Preventer

    Zurn Wilkins
    $ 651.99 - $ 651.99
    $ 651.99
    $ 651.99 - $ 651.99
    $ 651.99

    Designed for installation on potable water lines to protect against backsiphonage of contaminated water into the potable water supply. Assembly sh...

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    $ 651.99 - $ 651.99
    $ 651.99
    $ 651.99 - $ 651.99
    $ 651.99
    Sold out

  • 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

  • Febco Poppet Assembly Kit for 1/2", 3/4" 765 Pressure Vacuum Breaker

    Febco
    $ 26.08 - $ 26.08
    $ 26.08
    $ 26.08
    $ 26.08 - $ 26.08
    $ 26.08

    Febco: 1/2" - 3/4" - Poppet Assembly for a 765 Pressure Vacuum Breaker

    $ 26.08 - $ 26.08
    $ 26.08
    $ 26.08
    $ 26.08 - $ 26.08
    $ 26.08
  • Sold out

    Febco - 905212 - Bonnet and Poppet Assembly Kit for 1 inch and 1-1/4 inch Febco 765 Valves

    Febco
    $ 61.71 - $ 61.71
    $ 61.71
    $ 61.71 - $ 61.71
    $ 61.71

    Febco Bonnet and Poppet Assembly Kit 905212 is designed for 1 inch and 1-1/4 inch Febco 765 Valves. It provides long-lasting protection for pressur...

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    $ 61.71 - $ 61.71
    $ 61.71
    $ 61.71 - $ 61.71
    $ 61.71
    Sold out
  • Sold out

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

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

    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
    $ 786.00
    $ 786.00 - $ 786.00
    $ 786.00
    Sold out

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

    Febco
    $ 136.24 - $ 136.24
    $ 136.24
    $ 201.47
    $ 201.47 - $ 201.47
    $ 201.47

    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
    $ 201.47
    $ 201.47 - $ 201.47
    $ 201.47

  • Febco 3/4" Pressure Vacuum Breaker 3/4” 765-QT-FZ PVB 3/4 IN Bronze Pressure Vacuum Breaker Backflow

    Febco
    $ 189.19 - $ 189.19
    $ 189.19
    $ 189.19
    $ 189.19 - $ 189.19
    $ 189.19

    This 3/4 inch pressure vacuum breaker backflow preventer is used to protect against health hazard and non-hazard backsiphonage of toxic or non-tox...

    View full details
    $ 189.19 - $ 189.19
    $ 189.19
    $ 189.19
    $ 189.19 - $ 189.19
    $ 189.19

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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