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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 Kit de flotador de ventilación con interruptor de vacío de presión de 1 pulg.

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

    Este kit de reparación de ventilación 1 EN 800M4 proporciona todas las piezas necesarias para reparar el flotador de ventilación del interruptor d...

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

  • Febco 905211 Kit de reparación de capó para interruptores de vacío de presión 765 y preventores de reflujo, 1/2 pulgada y 3/4 pulgada

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

    Este kit de reparación de capó Febco 905211 está diseñado para interruptores de vacío a presión y preventores de contraflujo 765, con tamaños de 1...

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    $ 36.41 - $ 36.41
    $ 36.41
    $ 36.41 - $ 36.41
    $ 36.41

  • 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

  • Kit Watts Check 800m4 1" Watts PVB

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

    Kit de reparación de válvula de retención para disyuntor de vacío de presión 800M4-QT / 800M4-FR de 1" Este kit contiene lo siguiente: Com...

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    $ 34.29 - $ 34.29
    $ 34.29
    $ 34.29 - $ 34.29
    $ 34.29
  • Agotado

    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
    Agotado
  • Agotado

    Zurn Wilkins 721-20 Bonnet for 720A

    Zurn Wilkins
    $ 0.00 - $ 0.00
    $ 0.00
    $ 37.18
    $ 37.18 - $ 37.18
    $ 37.18

    Dimensions: 2" x 2" x 0.3" Weight: 1.6 oz

    $ 0.00 - $ 0.00
    $ 0.00
    $ 37.18
    $ 37.18 - $ 37.18
    $ 37.18
    Agotado

  • 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 KIT de flotador y ventilación de 1/2" y 3/4", PVB de reparación blanco

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

    El kit de reparación contiene: ventilación del flotador, conjunto de disco, sello y resorte y junta tórica del capó Para reparar la ventil...

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    $ 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 Primer kit de verificación para RPZ de 1" 0887789

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

    PRIMERA COMPROBACIÓN DEL KIT DE REPARACIÓN DEL CONJUNTO

    $ 80.75 - $ 80.75
    $ 80.75
    $ 80.75 - $ 80.75
    $ 80.75
  • Agotado

    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
    Agotado

  • 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
  • Agotado

    Kit de montaje de capó y asiento Febco 905212 para válvulas Febco 765 de 1 pulgada y 1-1/4 pulgadas

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

    El kit de montaje de capó y asiento Febco 905212 está diseñado para válvulas Febco 765 de 1 y 1-1/4 pulgadas. Proporciona protección duradera para ...

    Ver todos los detalles
    $ 61.71 - $ 61.71
    $ 61.71
    $ 61.71 - $ 61.71
    $ 61.71
    Agotado

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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