Skip to content
Enjoy fast and free shipping on all orders over $89! Contact us (855) 424-4376
Enjoy fast and free shipping on all orders over $89! Contact us (855) 424-4376

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.

  •

    Apollo 4A Series Pressure Vacuum Breaker Assembly | 3/4 in. & 1 in.

    Apollo
    $ 125.93 - $ 164.98
    $ 125.93 - $ 164.98
    $ 125.93 - $ 164.98
    $ 125.93

    Apollo 4A Series Pressure Vacuum Breaker Assembly Brand: Apollo (Conbraco) | SKUs: 4A504A2F, 4A505A2F Product Overview The Apollo 4A Series pre...

    View full details
    $ 125.93 - $ 164.98
    $ 125.93 - $ 164.98
    $ 125.93 - $ 164.98
    $ 125.93

  • Apollo 4A204A4F 3/4 in. Bronze FIP Reduced Pressure Backflow Preventer

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

    Apollo 4A204A4F 3/4 in. Bronze FIP Reduced Pressure Backflow Preventer Brand: Apollo | SKU: 4A204A4F Product Overview The Apollo 4A204A4F is a ...

    View full details
    $ 323.85 - $ 323.85
    $ 323.85
    $ 323.85 - $ 323.85
    $ 323.85

  • Apollo 4A Series Reduced Pressure Backflow Preventer | 3/4 in. & 1 in.

    Apollo
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99

    Apollo 4A Series Reduced Pressure Backflow Preventer Brand: Apollo (Conbraco) | SKUs: 4A204A2F, 4A205A2F Product Overview The Apollo 4A Series ...

    View full details
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99 - $ 369.90
    $ 297.99

  • Watts Water Technologies 1 in Pressure Vacuum Breaker Vent Float Kit

    Watts Water Technologies
    $ 18.00 - $ 18.00
    $ 18.00
    $ 18.00 - $ 18.00
    $ 18.00

    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...

    View full details
    $ 18.00 - $ 18.00
    $ 18.00
    $ 18.00 - $ 18.00
    $ 18.00
  • Febco 860-QT RP 100 backflow preventer product detail
    Febco 860-QT RP 100 1 inch reduced pressure zone assembly

    Febco 860-QT RP 100 1 in. 860 Reduced Pressure Zone Assembly

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

    Febco 860-QT RP 100 1 in. 860 Reduced Pressure Zone Assembly Brand: Febco | SKU: 860-QT RP 100 Important Lead-Free Notice This item is not lead...

    View full details
    $ 206.18 - $ 206.18
    $ 206.18
    $ 593.68
    $ 593.68 - $ 593.68
    $ 593.68

  • Watts - LF25AUB-Z3 - Water Pressure Reducing Valve 1 Inch Pipe Size 0009309

    Watts Water Technologies
    $ 505.65 - $ 505.65
    $ 505.65
    $ 505.65 - $ 505.65
    $ 505.65

    Spec Sheet Pressure reducing valves are usually installed in front of piping to help maintain pressure throughout your home. Watts Water Pressure R...

    View full details
    $ 505.65 - $ 505.65
    $ 505.65
    $ 505.65 - $ 505.65
    $ 505.65

  • 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...

    View full details
    $ 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...

    View full details
    $ 1,111.71 - $ 1,111.71
    $ 1,111.71
    $ 1,111.71 - $ 1,111.71
    $ 1,111.71
  • Febco 905211 bonnet repair kit for 1/2 inch and 3/4 inch 765 PVB

    Febco 905211 Bonnet Repair Kit for 1/2 in. and 3/4 in. 765 PVB

    Febco
    $ 54.63 - $ 54.63
    $ 54.63
    $ 54.63 - $ 54.63
    $ 54.63

    Febco 905211 Bonnet Repair Kit for 1/2 in. and 3/4 in. 765 PVB Brand: Febco | SKU: 905211 Product Overview The Febco 905211 bonnet repair kit i...

    View full details
    $ 54.63 - $ 54.63
    $ 54.63
    $ 54.63 - $ 54.63
    $ 54.63

  • 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...

    View full details
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76
    $ 1,171.76 - $ 1,171.76
    $ 1,171.76

  • 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...

    View full details
    $ 34.29 - $ 34.29
    $ 34.29
    $ 34.29 - $ 34.29
    $ 34.29
  • Sold out

    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 ...

    View full details
    $ 223.36 - $ 223.36
    $ 223.36
    $ 223.36 - $ 223.36
    $ 223.36
    Sold out
  • 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...

    View full details
    $ 483.32 - $ 483.32
    $ 483.32
    $ 483.32 - $ 483.32
    $ 483.32
    Sold out
  • Febco T765EUB 1 inch bronze PVB backflow preventer with unions and freeze sensor

    Febco T765EUB 1 in. Bronze PVB Backflow Preventer with Unions and Freeze Sensor

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

    Febco T765EUB 1 in. Bronze PVB Backflow Preventer with Unions and Freeze Sensor Brand: Febco | SKU: T765EUB Important Lead-Free Notice This pro...

    View full details
    $ 217.32 - $ 217.32
    $ 217.32
    $ 217.32
    $ 217.32 - $ 217.32
    $ 217.32

  • Watts - 0887709 - 1/2"& 3/4" Float & Vent KIT, White Repair PVB

    Watts Water Technologies
    $ 14.57 - $ 14.57
    $ 14.57
    $ 14.57 - $ 14.57
    $ 14.57

    Repair kit contains: float vent, disc assembly, seal and spring, and bonnet o-ring To repair Watts 800M4-1/2 and 3/4 vacuum breaker float vent

    $ 14.57 - $ 14.57
    $ 14.57
    $ 14.57 - $ 14.57
    $ 14.57

  • Watts RK 800M4-B 1 1 IN Pressure Vacuum Breaker Bonnet Assembly Kit 0887701

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 47.81
    $ 47.81 - $ 47.81
    $ 47.81

    This 1 IN 800M4 bonnet assembly repair kit provides all the parts necessary to replace the bonnet of the applicable pressure vacuum breaker. This ...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 47.81
    $ 47.81 - $ 47.81
    $ 47.81
  • Sold out

    Watts - 1-LF007M1-QT - 1 inch LF007M1-QT 1 Double Check Valve 0063232

    Watts Water Technologies
    $ 575.13 - $ 575.13
    $ 575.13
    $ 575.13 - $ 575.13
    $ 575.13

    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...

    View full details
    $ 575.13 - $ 575.13
    $ 575.13
    $ 575.13 - $ 575.13
    $ 575.13
    Sold out
  • Febco F1313 1 inch 860-QT-FS bronze RPZ backflow preventer with flood sensor

    Febco F1313 1 in. 860-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor

    Febco
    $ 525.99 - $ 525.99
    $ 525.99
    $ 588.06
    $ 588.06 - $ 588.06
    $ 588.06

    Febco F1313 1 in. 860-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F1313 Important Lead-Free Notice This product i...

    View full details
    $ 525.99 - $ 525.99
    $ 525.99
    $ 588.06
    $ 588.06 - $ 588.06
    $ 588.06
  • Febco 905212 bonnet and poppet assembly kit for 1 inch and 1-1/4 inch 765 valves

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

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

    Febco 905212 Bonnet and Poppet Assembly Kit for 1 in. and 1-1/4 in. 765 Valves Brand: Febco | SKU: 905212 Product Overview The Febco 905212 bon...

    View full details
    $ 61.71 - $ 61.71
    $ 61.71
    $ 61.71 - $ 61.71
    $ 61.71
  • Febco F2812 backflow preventer product detail
    Febco F2812 3/4 inch 860U-QT-FS bronze RPZ backflow preventer with flood sensor

    Febco F2812 3/4 in. 860U-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor

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

    Febco F2812 3/4 in. 860U-QT-FS Bronze RPZ Backflow Preventer with Flood Sensor Brand: Febco | SKU: F2812 Important Lead-Free Notice This item d...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 464.97
    $ 464.97 - $ 464.97
    $ 464.97

  • 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. ...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 147.99
    $ 147.99 - $ 147.99
    $ 147.99

  • Watts LFFPTC-F 1/8" - 1/8 In Lead Free Full Port Test Cock 781074LL

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 23.60
    $ 23.60 - $ 23.60
    $ 23.60

    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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 23.60
    $ 23.60 - $ 23.60
    $ 23.60

  • Watts LFFPTC-F 1/4" - 1/4 In Lead Free Full Port Test Cock 781075LL

    Watts Water Technologies
    $ 0.00 - $ 0.00
    $ 0.00
    $ 23.60
    $ 23.60 - $ 23.60
    $ 23.60

    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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 23.60
    $ 23.60 - $ 23.60
    $ 23.60
  • Febco 905049 poppet assembly kit for 1/2 inch and 3/4 inch 765 PVB

    Febco 905049 Poppet Assembly Kit for 1/2 in. and 3/4 in. 765 PVB

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

    Febco 905049 Poppet Assembly Kit for 1/2 in. and 3/4 in. 765 PVB Brand: Febco | SKU: 905049 Product Overview The Febco 905049 poppet assembly k...

    View full details
    $ 26.08 - $ 26.08
    $ 26.08
    $ 26.08
    $ 26.08 - $ 26.08
    $ 26.08

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....

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare