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  1. Febco FE850 DCA Backflow Preventer 1 in. FPT | FE850-100
    Febco FE850 DCA Backflow Preventer 1 in. FPT | FE850-100
    On-Sale $204.37 List Price $347.95
    HLSG SKU: RBW1567977
    SKU: FE850-100
  2. Conbraco 4A-100 DCA Backflow Preventer 1" FPT | CDC4A-105-A2F
    Conbraco 4A-100 DCA Backflow Preventer 1 in. FPT | CDC4A-105-A2F
    On-Sale $213.94 List Price $534.95
    HLSG SKU: CNB4A105T2F
    SKU: CDC4A-105-A2F
  3. Conbraco 4A-100 DCA Backflow Preventer 3/4" FPT | CDC4A-104-A2F
    Conbraco 4A-100 DCA Backflow Preventer 3/4 in. FPT | CDC4A-104-A2F
    On-Sale $191.46 List Price $252.25
    HLSG SKU: CNP4A104A2F
    SKU: CDC4A-104-A2F
  4. Febco FE850 DCA Backflow Preventer 3/4 in. | FE850-075
    Febco FE850 DCA Backflow Preventer 3/4 in. | FE850-075
    On-Sale $196.95 List Price $325.95
    HLSG SKU: WAT1112
    SKU: FE850-075
  5. Febco FE850 DCA Backflow Preventer 1-1/2" FPT | FE850-150
    Febco FE850 DCA Backflow Preventer 1-1/2 in. FPT | FE850-150
    On-Sale $583.74 List Price $1,179.95
    HLSG SKU: FEB850015
    SKU: FE850-150
  6. Wilkins 350FT DCA Backflow Preventer with SAE Male Test Cocks 1" FPT | WK350FT-100
    Wilkins 350FT DCA Backflow Preventer with SAE Male Test Cocks 1 in. FPT | WK350FT-100
    On-Sale $238.61 List Price $461.95
    HLSG SKU: WLK350010
    SKU: WK350FT-100
  7. Conbraco 4A-100 DCA Backflow Preventer 2" FPT | CDC4A-108-A2F
    Conbraco 4A-100 DCA Backflow Preventer 2 in. FPT | CDC4A-108-A2F
    On-Sale $641.49 List Price $825.95
    HLSG SKU: CNB4A108A2
    SKU: CDC4A-108-A2F
  8. Wilkins 350 DCA Backflow Preventer 1 in. | WK350-100
    Wilkins 350 DCA Backflow Preventer 1 in. | WK350-100
    On-Sale $238.61 List Price $377.14
    HLSG SKU: WLK350EZSWAP010
    SKU: WK350-100
  9. Conbraco 4A-100 DCA Backflow Preventer 1-1/2" FPT | CDC4A-107-A2F
    Conbraco 4A-100 DCA Backflow Preventer 1-1/2 in. FPT | CDC4A-107-A2F
    On-Sale $584.91 List Price $785.95
    HLSG SKU: CNP4A107A2F
    SKU: CDC4A-107-A2F
  10. Febco FE850 DCA Backflow Preventer 1-1/4 in. FPT | FE850-125
    Febco FE850 DCA Backflow Preventer 1-1/4 in. FPT | FE850-125
    On-Sale $552.61 List Price $916.95
    HLSG SKU: LDK1114
    SKU: FE850-125
  11. Febco U850 DCA Backflow Preventer 1 in. Union End Ball Valve | FEU850-100
    Febco U850 DCA Backflow Preventer 1 in. Union End Ball Valve | FEU850-100
    On-Sale $423.25 List Price $625.25
    SKU: FEU850-100
  12. Febco FE850 DCA Backflow Preventer 2 in. FPT | FE850-200
    Febco FE850 DCA Backflow Preventer 2 in. FPT | FE850-200
    On-Sale $652.97 List Price $1,325.95
    HLSG SKU: LDK1116
    SKU: FE850-200
  13. Febco U850 DCA Backflow Preventer 3/4" Union End Ball Valves | FEU850-075
    Febco U850 DCA Backflow Preventer 3/4 in. Union End Ball Valve | FEU850-075
    On-Sale $290.15 List Price $480.95
    HLSG SKU: FAF2612
    SKU: FEU850-075
  14. Wilkins Lead Free 350FT DCA Backflow Preventer with SAE Male Test Cocks 1 in. FPT | WK350XLFT-100
    Wilkins Lead Free 350FT DCA Backflow Preventer with SAE Male Test Cocks 1 in. FPT | WK350XLFT-100
    On-Sale $336.23 List Price $480.00
    HLSG SKU: WLK1350XLFT
    SKU: WK350XLFT-100
  15. Wilkins 350FT DCA Backflow Preventer with SAE Male Test Cocks 1-1/2" FPT | WK350FT-150
    Wilkins 350FT DCA Backflow Preventer with SAE Male Test Cocks 1-1/2 in. FPT | WK350FT-150
    On-Sale $640.47 List Price $980.95
    HLSG SKU: WLK112350FT
    SKU: WK350FT-150
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DCA Applications in Irrigation Systems

DCAs are suitable for systems with lower risk, where contaminants pose a nuisance risk rather than a serious health hazard. You’ll often find double check valves around lawn sprinklers without chemical injectors and basic irrigation systems without fertilizers or pesticides. Double check assemblies are a great choice for residential and commercial settings because they are less expensive than higher-grade backflow preventers like RPZ assemblies.

 

Double Check Assembly FAQs

Is a DCA required for all irrigation systems?

Not always. Some irrigation systems may only require simpler backflow preventers, like pressure vacuum breakers (PVBs), depending on local codes. A DCA is required when the system poses a risk of backpressure or backsiphonage but does not involve hazardous chemicals.

What factors should I consider when selecting a double check assembly?

First, consider your system’s water pressure capacity. Ensure the DCA is rated for your irrigation system's pressure levels, or it may fail. Next, match the DCA size to your system's pipe diameter. Finally, verify the device meets local codes and regulations.

Are DCA backflow preventers suitable for high-risk systems?

DCAs cannot provide the same level of protection as RPZ assemblies in situations involving health hazards, such as chemical injection in irrigation systems. Unlike an RPZ, a DCA does not have a relief valve to release potentially contaminated water.

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