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.
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Zurn Wilkins 12-375XL 1/2" 375 Reduced Pressure Principle Backflow Preventer
Zurn WilkinsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 910.99$ 910.99 - $ 910.99Current price $ 910.99The Zurn Wilkins 375XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable water applications. The EZSwap Pr...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 910.99$ 910.99 - $ 910.99Current price $ 910.99 -
Zurn 3-375AST 3" Reduced Pressure Principle Backflow Preventer with Stainless Steel Body
Zurn WilkinsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 6,474.99$ 6,474.99 - $ 6,474.99Current price $ 6,474.99The 375AST Reduced Pressure Principle Backflow Assembly is utilized in high hazard applications for all applications and market segments, protectin...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 6,474.99$ 6,474.99 - $ 6,474.99Current price $ 6,474.99 -
Zurn Wilkins - 2-975XL2 2" 975XL2 Reduced Pressure Principle Assembly (Lead Free)
Zurn WilkinsOriginal price $ 2,212.99 - Original price $ 2,212.99Original price$ 2,212.99$ 2,212.99 - $ 2,212.99Current price $ 2,212.99The 975XL2 Reduced Pressure Principle Assembly is used in high health hazard, potable water applications for protection from both backsiphonage and...
View full detailsOriginal price $ 2,212.99 - Original price $ 2,212.99Original price$ 2,212.99$ 2,212.99 - $ 2,212.99Current price $ 2,212.99 -
Zurn Wilkins 3" 375A Flanged NRS Reduced Pressure Principle Assembly
Zurn WilkinsOriginal price $ 5,917.99 - Original price $ 5,917.99Original price$ 5,917.99$ 5,917.99 - $ 5,917.99Current price $ 5,917.99The Zurn Wilkins 375A Reduced Pressure Principle Backflow Preventer provides high hazard protection for all market segments. The grooved, epoxy...
View full detailsOriginal price $ 5,917.99 - Original price $ 5,917.99Original price$ 5,917.99$ 5,917.99 - $ 5,917.99Current price $ 5,917.99Sold out -
Zurn Wilkins 112-375XL 1-1/2" 375 Reduced Pressure Principle Backflow Preventer
Zurn WilkinsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 1,727.99$ 1,727.99 - $ 1,727.99Current price $ 1,727.99375 Reduced Pressure Principle Backflow Assembly Spec Sheet The 375 Reduced Pressure Principle Backflow Assembly is utilized where a potential hig...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 1,727.99$ 1,727.99 - $ 1,727.99Current price $ 1,727.99 -
Zurn Wilkins 34-70XLDUC 3/4" 70XL Pressure Reducing Valve with Double Union FNPT Connection and FC (Cop/ Sweat) Union Connection
Zurn WilkinsOriginal price $ 257.99 - Original price $ 257.99Original price$ 257.99$ 257.99 - $ 257.99Current price $ 257.99The 70XL Pressure Reducing Valve is a contractor favorite, providing a variety of residential and commercial customers with extreme stability, rugg...
View full detailsOriginal price $ 257.99 - Original price $ 257.99Original price$ 257.99$ 257.99 - $ 257.99Current price $ 257.99Sold out -
Zurn Wilkins 34-NR3XLDUPEX 3/4 in. NR3XL Pressure Reducing Valve, Double Union Male Barbed PEX Connections
Zurn WilkinsOriginal price $ 232.99 - Original price $ 232.99Original price$ 232.99$ 232.99 - $ 232.99Current price $ 232.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 232.99 - Original price $ 232.99Original price$ 232.99$ 232.99 - $ 232.99Current price $ 232.99Sold out -
Zurn Wilkins 2-NR3XLDUC 2" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Union Connection
Zurn WilkinsOriginal price $ 1,387.99 - Original price $ 1,387.99Original price$ 1,387.99$ 1,387.99 - $ 1,387.99Current price $ 1,387.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 1,387.99 - Original price $ 1,387.99Original price$ 1,387.99$ 1,387.99 - $ 1,387.99Current price $ 1,387.99Sold out -
Zurn Wilkins 34-350XL 3/4" 350XL Double Check Backflow Preventer
Zurn WilkinsOriginal price $ 448.99 - Original price $ 448.99Original price$ 448.99$ 448.99 - $ 448.99Current price $ 448.99The 350XL Double Check Valve Assembly is used in low health hazard, potable water applications for protection against both back siphonage and backp...
View full detailsOriginal price $ 448.99 - Original price $ 448.99Original price$ 448.99$ 448.99 - $ 448.99Current price $ 448.99Sold out -
Zurn Wilkins 2-600XL 2" 600XL Pressure Reducing Valve
Zurn WilkinsOriginal price $ 1,552.99 - Original price $ 1,552.99Original price$ 1,552.99$ 1,552.99 - $ 1,552.99Current price $ 1,552.99The 600XL Pressure Reducing Valve handles sandy, debris-laden water systems for high-flow capacity in residential, commercial, and new construction...
View full detailsOriginal price $ 1,552.99 - Original price $ 1,552.99Original price$ 1,552.99$ 1,552.99 - $ 1,552.99Current price $ 1,552.99Sold out -
Zurn Wilkins 1-NR3XLDUC 1" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Connection
Zurn WilkinsOriginal price $ 279.99 - Original price $ 279.99Original price$ 279.99$ 279.99 - $ 279.99Current price $ 279.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 279.99 - Original price $ 279.99Original price$ 279.99$ 279.99 - $ 279.99Current price $ 279.99Sold out -
Zurn Wilkins 1-NR3XLDU 1 in. NR3XL Pressure Reducing Valve, Double Union FNPT Connections
Zurn WilkinsOriginal price $ 279.99 - Original price $ 279.99Original price$ 279.99$ 279.99 - $ 279.99Current price $ 279.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 279.99 - Original price $ 279.99Original price$ 279.99$ 279.99 - $ 279.99Current price $ 279.99Sold out -
Zurn Wilkins 114-600XL 1-1/4" 600XL Pressure Reducing Valve
Zurn WilkinsOriginal price $ 861.99 - Original price $ 861.99Original price$ 861.99$ 861.99 - $ 861.99Current price $ 861.99The 600XL Pressure Reducing Valve handles sandy, debris-laden water systems for high-flow capacity in residential, commercial, and new construction...
View full detailsOriginal price $ 861.99 - Original price $ 861.99Original price$ 861.99$ 861.99 - $ 861.99Current price $ 861.99Sold out -
Zurn Wilkins 114-NR3XL 1 1/4 in. NR3XL Pressure Reducing Valve, Single Union FNPT Connection
Zurn WilkinsOriginal price $ 659.99 - Original price $ 659.99Original price$ 659.99$ 659.99 - $ 659.99Current price $ 659.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 659.99 - Original price $ 659.99Original price$ 659.99$ 659.99 - $ 659.99Current price $ 659.99Sold out -
Zurn Wilkins 112-NR3XLDUC 1-1/2" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Connection
Zurn WilkinsOriginal price $ 1,096.99 - Original price $ 1,096.99Original price$ 1,096.99$ 1,096.99 - $ 1,096.99Current price $ 1,096.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
View full detailsOriginal price $ 1,096.99 - Original price $ 1,096.99Original price$ 1,096.99$ 1,096.99 - $ 1,096.99Current price $ 1,096.99Sold out -
Zurn Wilkins 34-NR3XLDU 3/4" Lead Free Water Pressure Reducing Valve w/ Integral By-Pass Check Valve
Zurn WilkinsOriginal price $ 232.99 - Original price $ 232.99Original price$ 232.99$ 232.99 - $ 232.99Current price $ 232.99Ideal for use where lead free valves are required. Designed for installation on potable water lines to reduce high inlet pressure to a lower outle...
View full detailsOriginal price $ 232.99 - Original price $ 232.99Original price$ 232.99$ 232.99 - $ 232.99Current price $ 232.99Sold out -
Zurn Wilkins 1-70XLDU 1" Pressure Reducing Valve w/ FNPT Double Union Connections
Zurn WilkinsOriginal price $ 298.99 - Original price $ 298.99Original price$ 298.99$ 298.99 - $ 298.99Current price $ 298.99The model 70XL has been providing residential and commercial customers with ruggedness and ease of repair for over 40 years. Ideal for use where Le...
View full detailsOriginal price $ 298.99 - Original price $ 298.99Original price$ 298.99$ 298.99 - $ 298.99Current price $ 298.99Sold out -
Zurn Wilkins 112-975XL2S 1-1/2" Lead Free Wilkins 975XL2 Reduced Pressure Principle Assembly w/ Bronze "Y" Strainer
Zurn WilkinsOriginal price $ 2,260.99 - Original price $ 2,260.99Original price$ 2,260.99$ 2,260.99 - $ 2,260.99Current price $ 2,260.99The 975XL2 Reduced Pressure Principle Assembly is used in high health hazard, potable water applications for protection from both backsiphonage and...
View full detailsOriginal price $ 2,260.99 - Original price $ 2,260.99Original price$ 2,260.99$ 2,260.99 - $ 2,260.99Current price $ 2,260.99Sold out -
Zurn Wilkins 1-600XL 1" Lead Free FNPT Union x FNPT Pressure Reducing Valve
Zurn WilkinsOriginal price $ 483.99 - Original price $ 483.99Original price$ 483.99$ 483.99 - $ 483.99Current price $ 483.99Zurn Wilkins Model 34-600XL 1" Water Pressure Reducing Brass Valve with Integral By-pass Check Valve and Strainer, FNPT Union x FNPT, Lead Free ...
View full detailsOriginal price $ 483.99 - Original price $ 483.99Original price$ 483.99$ 483.99 - $ 483.99Current price $ 483.99Sold out -
Zurn Wilkins 1-NR3XL 1" NR3 Water Pressure Reducing Valve
Zurn WilkinsOriginal price $ 274.99 - Original price $ 274.99Original price$ 274.99$ 274.99 - $ 274.99Current price $ 274.99The NR3XL Pressure Reducing Valve provides reliable pressure reduction for residential applications, and is available with a variety of end connec...
View full detailsOriginal price $ 274.99 - Original price $ 274.99Original price$ 274.99$ 274.99 - $ 274.99Current price $ 274.99Sold out -
Zurn Wilkins 34-600XL 600XL FNPT Union x FNPT Pressure Reducing Valve (Lead Free)
Zurn WilkinsOriginal price $ 334.99 - Original price $ 334.99Original price$ 334.99$ 334.99 - $ 334.99Current price $ 334.99Zurn Wilkins Model 34-600XL 3/4" Water Pressure Reducing Brass Valve with Integral By-pass Check Valve and Strainer, FNPT Union x FNPT, Lead Free ...
View full detailsOriginal price $ 334.99 - Original price $ 334.99Original price$ 334.99$ 334.99 - $ 334.99Current price $ 334.99Sold out -
Watts RK 009M2-CK2 1 1 IN Reduced Pressure Zone Assembly Backflow Repair Kit, Second Check Kit, for 009M2 0887790
Watts Water TechnologiesOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 73.60$ 73.60 - $ 73.60Current price $ 73.60This 1 IN 009M2 second check repair kit provides all the parts necessary to replace the major internal components of the applicable reduced pressu...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 73.60$ 73.60 - $ 73.60Current price $ 73.60 -
Watts LF009M3-QT-S 3/4 3/4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer (Discontinued)
Watts Water TechnologiesOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 579.00$ 579.00 - $ 579.00Current price $ 579.003/4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer Lead Free: YES 0122695 This 3/4 i...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 579.00$ 579.00 - $ 579.00Current price $ 579.00 -
Watts - 3/4-LF860-QT RP - 3/4" RPZ Lead Free 860 Series Reduced Pressure Zone Assy #0683001
Watts Water TechnologiesOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 675.97$ 675.97 - $ 675.97Current price $ 675.97This 3/4 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of high hazard (toxic) fluids fo...
View full detailsOriginal price $ 0.00 - Original price $ 0.00Original price $ 0.00$ 675.97$ 675.97 - $ 675.97Current price $ 675.97
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