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SKU: 007-040

Watts 007-040 40mm 1½" DCV Double Check Valve Backflow Preventer Device/Kits

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    Click here to be notified by email when Watts 007-040 40mm 1½" DCV Double Check Valve Backflow Preventer Device/Kits becomes available.


    The listing is for Watts 007-040 40mm 1 1/2" DCV double check valve backflow preventer range in 3 configuration variants

    - Device Only (007-040)

    - Kits with Strainer & 2 Lockable Ball Valves (007-040-LBS)

    - Kits with 2 Unions, Strainer & 2 Lockable Ball Valves (007-040-ULBS)

    The Watts double check valve DCV backflow preventers are designed to protect portable drinking water in the mains supplies from cross-connections from water applications such as irrigation, fireline or industrial processing. The Watts DCV is compatible with other popular brands such as Fabco, Tyco, Wilkins and Conbraco Apollo.

    The use of the Watts double check valves DCV back flow preventer must be in accordance with the Australian national plumbing codes and local plumbing requirements, who shall deem the applications as non-health hazardous in nature. The local authorities will have the jurisdiction regarding the vertical orientation, frequency of testing or any other requirements. 

    In other situations where the cross-connections contain hazardous chemicals, such as swimming pools or sewage processing plants, the potential contamination can be lethal or dangerous. The double check valve DCV backflow preventer may be regarded as insufficient protections by the plumbing authorities. In this case, a RPZ reduced pressure zone backflow preventer must be used instead. A RPZ reduced pressure zone backflow preventer's design differs from the DCV by featuring an additional differential release valve as a mechanical fail-safe device which will open and dump contaminated water to isolate the mains water supply. 

    A RPZ is usually significantly more expensive than the equivalent DCV counterparts, even though they may look very similar. Customers need to check with the local plumbing authority to ensure the correct backflow preventers are employed for the jobs. 

    All Plumbing Online stocks and supplies both Watts DCV and RPZ in full range of sizes and kits configurations. Just ask me any further questions if still unsure between DCVs and RPZs. All Watts DCV and RPZ are Watermark approved and are one of the most popular kits in Australian market due to its reputations and values for money.


    Technical Details

    Manufacturer: Watts

    Maximum Working Pressure: 1400 kPa
    Temperature Range: 0.5°C to 90°C

    Thread Size: BSP 1 1/2", 40mm

    Thread Physical Measurements: 47.803mm external male/internal female thread (refer to the BSP vs Physical measurement table chart in the photo gallery)

    Material: DR Brass

    • Ease of maintenance - only one cover 
    • Top entry
    • Replaceable seats and seat discs
    • Modular construction
    • Compact design
    • Cast bronze body construction
    • Top mounted ball valve test cocks 
    • Low pressure drop
    • No Special tools required for servicing 

    Intended Use: Prevent backflow to protect drinking water supplies from contamination 



    1 year replacement (parts only) warranty from purchase date is offered by All Plumbing Online. 


    Return Policy

    30 days worry free return is offered for peace of mind. All returned items must NOT be installed or with any water running through them. The original packaging must be supplied in resealable conditions. 


    Contact Us

    All Plumbing Online is a local business based in Brisbane, run by an experienced engineer who works as a consultant to the plumbing industry at manufacturers' level. I used to operate my own plumbing company and can answer any of your plumbing related questions, such as fitments, sizing or just chatting in general for advice.

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