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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

    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

  • 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
  • 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

  • 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

  • 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...

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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
  • 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

  • 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...

    View full details
    $ 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...

    View full details
    $ 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...

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    $ 560.08 - $ 560.08
    $ 560.08
    $ 560.08
    $ 560.08 - $ 560.08
    $ 560.08
  • 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
  • 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...

    View full details
    $ 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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