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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.
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Zurn Wilkins 34-720A 3/4 Inch Pressure Vacuum Breaker Assembly
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 147.99$ 147.99 - $ 147.99Precio actual $ 147.99Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 147.99$ 147.99 - $ 147.99Precio actual $ 147.99 -
Zurn Wilkins 1-975XL 1" 975XL Reduced Pressure Principle Assembly
Zurn WilkinsPrecio original $ 777.99 - Precio original $ 777.99Precio original$ 777.99$ 777.99 - $ 777.99Precio actual $ 777.99The 975XL Reduced Pressure Principle Backflow Assembly is used on non-potable water applications for high health hazard protection from both backsi...
Ver todos los detallesPrecio original $ 777.99 - Precio original $ 777.99Precio original$ 777.99$ 777.99 - $ 777.99Precio actual $ 777.99 -
Zurn Wilkins 1-975XLS 1" 975XL Reduced Pressure Assembly w/ Bronze Wye Strainer (Discontinued)
Zurn WilkinsPrecio original $ 902.99 - Precio original $ 902.99Precio original$ 902.99$ 902.99 - $ 902.99Precio actual $ 902.99The Zurn Wilkins 975XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for non-potable water applications. The wye p...
Ver todos los detallesPrecio original $ 902.99 - Precio original $ 902.99Precio original$ 902.99$ 902.99 - $ 902.99Precio actual $ 902.99 -
Zurn 1-975XL3 1" Reduced Pressure Principle Backflow Preventer
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 936.99$ 936.99 - $ 936.99Precio actual $ 936.99The Zurn Wilkins 975XL3 Reduced Pressure Principle Backflow Assembly provides high hazard protection against backsiphonage and backpressure in pota...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 936.99$ 936.99 - $ 936.99Precio actual $ 936.99 -
Zurn Wilkins 34-975XL 3/4" Reduced Pressure Principle Backflow Preventor
Zurn WilkinsPrecio original $ 732.99 - Precio original $ 732.99Precio original$ 732.99$ 732.99 - $ 732.99Precio actual $ 732.99The Zurn Wilkins 975XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for non-potable water applications. The wye p...
Ver todos los detallesPrecio original $ 732.99 - Precio original $ 732.99Precio original$ 732.99$ 732.99 - $ 732.99Precio actual $ 732.99 -
Zurn Wilkins 34-975XL2 3/4" 975XL2 Reduced Pressure Principle Assembly (Lead Free)
Zurn WilkinsPrecio original $ 1,025.99 - Precio original $ 1,025.99Precio original$ 1,025.99$ 1,025.99 - $ 1,025.99Precio actual $ 1,025.99Spec Sheet Install Manual The Zurn Wilkins 975XL2 Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable wa...
Ver todos los detallesPrecio original $ 1,025.99 - Precio original $ 1,025.99Precio original$ 1,025.99$ 1,025.99 - $ 1,025.99Precio actual $ 1,025.99 -
Zurn 1" 375 RP Ball Vlv NPT Top Access Lead Free Red Pressure Principle Backflow Preventer
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 936.99$ 936.99 - $ 936.99Precio actual $ 936.99The Zurn Wilkins 375XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable water applications. The EZSwap Pr...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 936.99$ 936.99 - $ 936.99Precio actual $ 936.99 -
Zurn 1-975XL2 1" Reduced Pressure Principle Backflow Preventer No Lead
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 1,084.99$ 1,084.99 - $ 1,084.99Precio actual $ 1,084.99The 975XL2 Reduced Pressure Principle Assembly is used in high health hazard, potable water applications for protection from both backsiphonage and...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 1,084.99$ 1,084.99 - $ 1,084.99Precio actual $ 1,084.99 -
Zurn Wilkins 34-375XL 3/4" 375 Reduced Pressure Principle Backflow Preventer
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 884.99$ 884.99 - $ 884.99Precio actual $ 884.99375 Reduced Pressure Principle Backflow Assembly Spec Sheet The 375 Reduced Pressure Principle Backflow Assembly is utilized where a potential hig...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 884.99$ 884.99 - $ 884.99Precio actual $ 884.99 -
Zurn 1/2" 975 Reduced Pressure Principle Backflow Preventer Lead Free
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 981.99$ 981.99 - $ 981.99Precio actual $ 981.99The Zurn Wilkins 975XL2 Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable water applications. The wye patte...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 981.99$ 981.99 - $ 981.99Precio actual $ 981.99 -
Zurn Wilkins 4-375AST 4" 375 Reduced Pressure Principle Backflow Preventer with Stainless Steel Body
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 6,401.99$ 6,401.99 - $ 6,401.99Precio actual $ 6,401.99375 Reduced Pressure Principle Backflow Assembly Spec Sheet The 375 Reduced Pressure Principle Backflow Assembly is utilized where a potential hig...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 6,401.99$ 6,401.99 - $ 6,401.99Precio actual $ 6,401.99 -
Zurn Wilkins 12-375XL 1/2" 375 Reduced Pressure Principle Backflow Preventer
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 867.99$ 867.99 - $ 867.99Precio actual $ 867.99The Zurn Wilkins 375XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for potable water applications. The EZSwap Pr...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 867.99$ 867.99 - $ 867.99Precio actual $ 867.99 -
Zurn 3-375AST 3" Reduced Pressure Principle Backflow Preventer with Stainless Steel Body
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 5,635.99$ 5,635.99 - $ 5,635.99Precio actual $ 5,635.99The 375AST Reduced Pressure Principle Backflow Assembly is utilized in high hazard applications for all applications and market segments, protectin...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 5,635.99$ 5,635.99 - $ 5,635.99Precio actual $ 5,635.99 -
Zurn Wilkins - 2-975XL2 2" 975XL2 Reduced Pressure Principle Assembly (Lead Free)
Zurn WilkinsPrecio original $ 2,107.99 - Precio original $ 2,107.99Precio original$ 2,107.99$ 2,107.99 - $ 2,107.99Precio actual $ 2,107.99The 975XL2 Reduced Pressure Principle Assembly is used in high health hazard, potable water applications for protection from both backsiphonage and...
Ver todos los detallesPrecio original $ 2,107.99 - Precio original $ 2,107.99Precio original$ 2,107.99$ 2,107.99 - $ 2,107.99Precio actual $ 2,107.99 -
Zurn Wilkins 3" 375A Flanged NRS Reduced Pressure Principle Assembly
Zurn WilkinsPrecio original $ 5,635.99 - Precio original $ 5,635.99Precio original$ 5,635.99$ 5,635.99 - $ 5,635.99Precio actual $ 5,635.99The Zurn Wilkins 375A Reduced Pressure Principle Backflow Preventer provides high hazard protection for all market segments. The grooved, epoxy...
Ver todos los detallesPrecio original $ 5,635.99 - Precio original $ 5,635.99Precio original$ 5,635.99$ 5,635.99 - $ 5,635.99Precio actual $ 5,635.99 -
Zurn Wilkins 112-375XL 1-1/2" 375 Reduced Pressure Principle Backflow Preventer
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 1,644.99$ 1,644.99 - $ 1,644.99Precio actual $ 1,644.99375 Reduced Pressure Principle Backflow Assembly Spec Sheet The 375 Reduced Pressure Principle Backflow Assembly is utilized where a potential hig...
Ver todos los detallesPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 1,644.99$ 1,644.99 - $ 1,644.99Precio actual $ 1,644.99 -
Zurn Wilkins 34-70XLDUC 3/4" 70XL Pressure Reducing Valve with Double Union FNPT Connection and FC (Cop/ Sweat) Union Connection
Zurn WilkinsPrecio original $ 244.99 - Precio original $ 244.99Precio original$ 244.99$ 244.99 - $ 244.99Precio actual $ 244.99The 70XL Pressure Reducing Valve is a contractor favorite, providing a variety of residential and commercial customers with extreme stability, rugg...
Ver todos los detallesPrecio original $ 244.99 - Precio original $ 244.99Precio original$ 244.99$ 244.99 - $ 244.99Precio actual $ 244.99Agotado -
Zurn Wilkins 34-NR3XLDUPEX 3/4 in. NR3XL Pressure Reducing Valve, Double Union Male Barbed PEX Connections
Zurn WilkinsPrecio original $ 221.99 - Precio original $ 221.99Precio original$ 221.99$ 221.99 - $ 221.99Precio actual $ 221.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
Ver todos los detallesPrecio original $ 221.99 - Precio original $ 221.99Precio original$ 221.99$ 221.99 - $ 221.99Precio actual $ 221.99Agotado -
Zurn Wilkins 2-NR3XLDUC 2" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Union Connection
Zurn WilkinsPrecio original $ 1,321.99 - Precio original $ 1,321.99Precio original$ 1,321.99$ 1,321.99 - $ 1,321.99Precio actual $ 1,321.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
Ver todos los detallesPrecio original $ 1,321.99 - Precio original $ 1,321.99Precio original$ 1,321.99$ 1,321.99 - $ 1,321.99Precio actual $ 1,321.99Agotado -
Zurn Wilkins 34-350XL 3/4" 350XL Double Check Backflow Preventer
Zurn WilkinsPrecio original $ 427.99 - Precio original $ 427.99Precio original$ 427.99$ 427.99 - $ 427.99Precio actual $ 427.99The 350XL Double Check Valve Assembly is used in low health hazard, potable water applications for protection against both back siphonage and backp...
Ver todos los detallesPrecio original $ 427.99 - Precio original $ 427.99Precio original$ 427.99$ 427.99 - $ 427.99Precio actual $ 427.99Agotado -
Zurn Wilkins 2-600XL 2" 600XL Pressure Reducing Valve
Zurn WilkinsPrecio original $ 1,477.99 - Precio original $ 1,477.99Precio original$ 1,477.99$ 1,477.99 - $ 1,477.99Precio actual $ 1,477.99The 600XL Pressure Reducing Valve handles sandy, debris-laden water systems for high-flow capacity in residential, commercial, and new construction...
Ver todos los detallesPrecio original $ 1,477.99 - Precio original $ 1,477.99Precio original$ 1,477.99$ 1,477.99 - $ 1,477.99Precio actual $ 1,477.99Agotado -
Zurn Wilkins 1-NR3XLDUC 1" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Connection
Zurn WilkinsPrecio original $ 266.99 - Precio original $ 266.99Precio original$ 266.99$ 266.99 - $ 266.99Precio actual $ 266.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
Ver todos los detallesPrecio original $ 266.99 - Precio original $ 266.99Precio original$ 266.99$ 266.99 - $ 266.99Precio actual $ 266.99Agotado -
Zurn Wilkins 1-NR3XLDU 1 in. NR3XL Pressure Reducing Valve, Double Union FNPT Connections
Zurn WilkinsPrecio original $ 266.99 - Precio original $ 266.99Precio original$ 266.99$ 266.99 - $ 266.99Precio actual $ 266.99Our time-tested Pressure Reducing Valves are ideal for residential applications that require frequent cleaning of sediment and debris prevent build...
Ver todos los detallesPrecio original $ 266.99 - Precio original $ 266.99Precio original$ 266.99$ 266.99 - $ 266.99Precio actual $ 266.99Agotado -
Zurn Wilkins 12-720A 1/2" 720A Pressure Vacuum Breaker Assembly
Zurn WilkinsPrecio original $ 159.99 - Precio original $ 159.99Precio original$ 159.99$ 159.99 - $ 159.99Precio actual $ 159.99Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...
Ver todos los detallesPrecio original $ 159.99 - Precio original $ 159.99Precio original$ 159.99$ 159.99 - $ 159.99Precio actual $ 159.99Agotado
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