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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.

  • Agotado

    FEBCO 3/4 pulg. 765 Preventor de reflujo

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

    Manual de instalación de la hoja de especificaciones Rompevacíos de presión Serie 765 Tamaño: 1/2" - 2" (15 mm - 50 mm) Los interruptore...

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    $ 116.62 - $ 116.62
    $ 116.62
    $ 116.62 - $ 116.62
    $ 116.62
    Agotado

  • Conjunto de zona de presión reducida Febco 1" 860

    Febco
    $ 206.18 - $ 206.18
    $ 206.18
    $ 593.68
    $ 593.68 - $ 593.68
    $ 593.68

    Hoja de especificaciones Mantenimiento para la prevención de congelación Los conjuntos de zona de presión reducida FEBCO Serie 860 se utiliz...

    Ver todos los detalles
    $ 206.18 - $ 206.18
    $ 206.18
    $ 593.68
    $ 593.68 - $ 593.68
    $ 593.68
  • Agotado

    Febco 765 Disyuntor de presión de 1" Watts con conexiones de unión

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

    Hoja de especificaciones Manual de instalación Los rompevacíos de presión Serie 765 están diseñados para instalarse para brindar protecci...

    Ver todos los detalles
    $ 210.00
    $ 210.00 - $ 210.00
    $ 210.00
    $ 199.99
    $ 199.99 - $ 199.99
    $ 199.99
    Agotado

  • 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

  • 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 0.00 - $ 0.00
    $ 0.00
    $ 464.97
    $ 464.97 - $ 464.97
    $ 464.97
  • Agotado

    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...

    Ver todos los detalles
    $ 653.33 - $ 653.33
    $ 653.33
    $ 653.33
    $ 653.33 - $ 653.33
    $ 653.33
    Agotado

  • 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 217.32 - $ 217.32
    $ 217.32
    $ 217.32
    $ 217.32 - $ 217.32
    $ 217.32

  • 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

  • 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 294.70 - $ 294.70
    $ 294.70
    $ 294.70
    $ 294.70 - $ 294.70
    $ 294.70
  • 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

  • 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...

    Ver todos los detalles
    $ 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
    $ 1,219.36
    $ 1,219.36 - $ 1,219.36
    $ 1,219.36

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

    Ver todos los detalles
    $ 1,219.36 - $ 1,219.36
    $ 1,219.36
    $ 1,219.36
    $ 1,219.36 - $ 1,219.36
    $ 1,219.36

  • 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
    $ 560.08
    $ 560.08 - $ 560.08
    $ 560.08

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

    Ver todos los detalles
    $ 560.08 - $ 560.08
    $ 560.08
    $ 560.08
    $ 560.08 - $ 560.08
    $ 560.08
  • Agotado

    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 ...

    Ver todos los detalles
    $ 146.61 - $ 146.61
    $ 146.61
    $ 146.61
    $ 146.61 - $ 146.61
    $ 146.61
    Agotado
  • Agotado

    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...

    Ver todos los detalles
    $ 786.00 - $ 786.00
    $ 786.00
    $ 786.00
    $ 786.00 - $ 786.00
    $ 786.00
    Agotado

  • 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...

    Ver todos los detalles
    $ 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...

    Ver todos los detalles
    $ 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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