Inline Backflow Preventer - Plumbing Supply in Seattle?

Discussion in 'Irrigation / Sprinkler Forum' started by eggtimer, Apr 29, 2005.

  1. eggtimer

    eggtimer New Member

    Apr 29, 2005
    I am installing three new outside water lines (2 sillcocks, and 1 sprinkler) by connecting to the 3/4 supply that also supplies my bathrooms, kitchen and water heater. The outside fausets and sprinkler are at the end of the line, and extend about 10ft from the closest drinkable supply.

    I know that a backflow device is required, but standard siphon sillcocks can't be used because of clearance between the joists. I'd like to install a single inline backflow device at the end of my 3/4 supply, before it meets the T's leading to the sprinklers and sillcocks.

    Unfortunally, I can't find anyone in the Seattle area who carries these things in stock, and of course, none of the big guys (*********, McClendons, etc.. could help). Anyone have any suggestions on where I can purchase one of these. I found the exact one I need from B&K (last page, top):

    Thanks in advance.
  2. RioHyde

    RioHyde Plumber

    Sep 24, 2004
    Cincinnati, Ohio
    Not sure about the Seattle area, but every supply house (Ferguson, Winnelson, Kemper, etc.) here in Cincinnati carries a dual check backflow preventer. Ask for a 3/4" Watts Series 7 dual check valve.

    As far as the silcocks go, you can install a hose connection vacuum breaker on them.

    Check on Watts Regulator's website.
    You can do a search for the Series 7 and the vacuum breaker. I tried to post links to both pages, but for some reason I cant. Both products are there however.

    Good luck!
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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
  5. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    In most areas a dual check valve is not sufficient backflow prevention for a sprinkler. In residential use, vacuum breaker-type valve is minimum. For mulifamily you usually are required to have reduced-pressure-principle double check valve type. Both of the aforementioned cannot be inside your dwelling.
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