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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 114-600XL 1-1/4" 600XL Pressure Reducing Valve
Zurn WilkinsPrecio original $ 819.99 - Precio original $ 819.99Precio original$ 819.99$ 819.99 - $ 819.99Precio actual $ 819.99The 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 $ 819.99 - Precio original $ 819.99Precio original$ 819.99$ 819.99 - $ 819.99Precio actual $ 819.99Agotado -
Zurn Wilkins 112-720A 1-1/2" 720A Pressure Vacuum Breaker Assembly
Zurn WilkinsPrecio original $ 795.99 - Precio original $ 795.99Precio original$ 795.99$ 795.99 - $ 795.99Precio actual $ 795.99Our Pressure Vacuum Breaker protects against back siphonage in high health hazard, non-potable residential and commercial irrigation applications. ...
Ver todos los detallesPrecio original $ 795.99 - Precio original $ 795.99Precio original$ 795.99$ 795.99 - $ 795.99Precio actual $ 795.99Agotado -
Zurn Wilkins 114-NR3XL 1 1/4 in. NR3XL Pressure Reducing Valve, Single Union FNPT Connection
Zurn WilkinsPrecio original $ 627.99 - Precio original $ 627.99Precio original$ 627.99$ 627.99 - $ 627.99Precio actual $ 627.99Our 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 $ 627.99 - Precio original $ 627.99Precio original$ 627.99$ 627.99 - $ 627.99Precio actual $ 627.99Agotado -
Zurn Wilkins 112-NR3XLDUC 1-1/2" NR3XL Pressure Reducing Valve with Double Union FNPT Copper Sweat Connection
Zurn WilkinsPrecio original $ 1,043.99 - Precio original $ 1,043.99Precio original$ 1,043.99$ 1,043.99 - $ 1,043.99Precio actual $ 1,043.99Our 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 $ 1,043.99 - Precio original $ 1,043.99Precio original$ 1,043.99$ 1,043.99 - $ 1,043.99Precio actual $ 1,043.99Agotado -
Zurn Wilkins 34-NR3XLDU 3/4" Lead Free Water Pressure Reducing Valve w/ Integral By-Pass Check Valve
Zurn WilkinsPrecio original $ 221.99 - Precio original $ 221.99Precio original$ 221.99$ 221.99 - $ 221.99Precio actual $ 221.99Ideal for use where lead free valves are required. Designed for installation on potable water lines to reduce high inlet pressure to a lower outle...
Ver todos los detallesPrecio original $ 221.99 - Precio original $ 221.99Precio original$ 221.99$ 221.99 - $ 221.99Precio actual $ 221.99Agotado -
Zurn Wilkins 1-70XLDU 1" Pressure Reducing Valve w/ FNPT Double Union Connections
Zurn WilkinsPrecio original $ 283.99 - Precio original $ 283.99Precio original$ 283.99$ 283.99 - $ 283.99Precio actual $ 283.99The model 70XL has been providing residential and commercial customers with ruggedness and ease of repair for over 40 years. Ideal for use where Le...
Ver todos los detallesPrecio original $ 283.99 - Precio original $ 283.99Precio original$ 283.99$ 283.99 - $ 283.99Precio actual $ 283.99Agotado -
Zurn Wilkins 112-975XL2S 1-1/2" Lead Free Wilkins 975XL2 Reduced Pressure Principle Assembly w/ Bronze "Y" Strainer
Zurn WilkinsPrecio original $ 2,153.99 - Precio original $ 2,153.99Precio original$ 2,153.99$ 2,153.99 - $ 2,153.99Precio actual $ 2,153.99The 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 $ 2,153.99 - Precio original $ 2,153.99Precio original$ 2,153.99$ 2,153.99 - $ 2,153.99Precio actual $ 2,153.99Agotado -
Zurn Wilkins 1-600XL 1" Lead Free FNPT Union x FNPT Pressure Reducing Valve
Zurn WilkinsPrecio original $ 459.99 - Precio original $ 459.99Precio original$ 459.99$ 459.99 - $ 459.99Precio actual $ 459.99Zurn Wilkins Model 34-600XL 1" Water Pressure Reducing Brass Valve with Integral By-pass Check Valve and Strainer, FNPT Union x FNPT, Lead Free ...
Ver todos los detallesPrecio original $ 459.99 - Precio original $ 459.99Precio original$ 459.99$ 459.99 - $ 459.99Precio actual $ 459.99Agotado -
Zurn Wilkins 1-NR3XL 1" NR3 Water Pressure Reducing Valve
Zurn WilkinsPrecio original $ 261.99 - Precio original $ 261.99Precio original$ 261.99$ 261.99 - $ 261.99Precio actual $ 261.99The NR3XL Pressure Reducing Valve provides reliable pressure reduction for residential applications, and is available with a variety of end connec...
Ver todos los detallesPrecio original $ 261.99 - Precio original $ 261.99Precio original$ 261.99$ 261.99 - $ 261.99Precio actual $ 261.99Agotado -
Zurn Wilkins 34-950XLT2 3/4" Wilkins 950XLT2 Double Check Valve Assembly (Lead Free)
Zurn WilkinsPrecio original $ 462.99 - Precio original $ 462.99Precio original$ 462.99$ 462.99 - $ 462.99Precio actual $ 462.99The Zurn Wilkins 950XLT2 Double Check Valve Assembly provides top access check covers. Suitable for below grade installation in standard valve box...
Ver todos los detallesPrecio original $ 462.99 - Precio original $ 462.99Precio original$ 462.99$ 462.99 - $ 462.99Precio actual $ 462.99Agotado -
Zurn Wilkins RK1-720A 1/2" - 2" Pressure Vacuum Breaker Repair Kit
Zurn WilkinsPrecio original $ 74.99 - Precio original $ 74.99Precio original$ 74.99$ 74.99 - $ 74.99Precio actual $ 74.99Complete repair kit for the 720A Pressure Vacuum Breaker. Kits fits the 1/2" - 2" models of the Wilkins 720A Includes poppet assembly, spider asse...
Ver todos los detallesPrecio original $ 74.99 - Precio original $ 74.99Precio original$ 74.99$ 74.99 - $ 74.99Precio actual $ 74.99Agotado -
Zurn Wilkins 114-720A 720A 1.25 inch PVB Backflow Preventer
Zurn WilkinsPrecio original $ 651.99 - Precio original $ 651.99Precio original$ 651.99$ 651.99 - $ 651.99Precio actual $ 651.99Designed for installation on potable water lines to protect against backsiphonage of contaminated water into the potable water supply. Assembly sh...
Ver todos los detallesPrecio original $ 651.99 - Precio original $ 651.99Precio original$ 651.99$ 651.99 - $ 651.99Precio actual $ 651.99Agotado -
Zurn Wilkins 34-600XL 600XL FNPT Union x FNPT Pressure Reducing Valve (Lead Free)
Zurn WilkinsPrecio original $ 318.99 - Precio original $ 318.99Precio original$ 318.99$ 318.99 - $ 318.99Precio actual $ 318.99Zurn 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 ...
Ver todos los detallesPrecio original $ 318.99 - Precio original $ 318.99Precio original$ 318.99$ 318.99 - $ 318.99Precio actual $ 318.99Agotado -
Zurn Wilkins 721-20 Bonnet for 720A
Zurn WilkinsPrecio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 37.18$ 37.18 - $ 37.18Precio actual $ 37.18Dimensions: 2" x 2" x 0.3" Weight: 1.6 oz
Precio original $ 0.00 - Precio original $ 0.00Precio original $ 0.00$ 37.18$ 37.18 - $ 37.18Precio actual $ 37.18Agotado
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Freeze Protecting Your Pressure Vacuum Breaker
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The difference between a Pressure Vacuum Breaker and a Reduced Pressure Zone
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