Backflow fitting needed? Is different metals acceptable?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Cygarbuff, Aug 8, 2014.

  1. Cygarbuff

    Cygarbuff New Member

    Joined:
    Nov 7, 2004
    Occupation:
    Auto Glass Installer
    Location:
    Tewksbury, Ma
    Hi guys, I had disconnected my black flex irrigation pipe from my back flow preventer since I am on well water now for irrigation. Where I took the gray plastic fitting out I'm looking to put a boiler drain of some sort there. I can't find a drain that has the 1" male threads I need so the guy at Home Depot gave me a 3/4" brass boiler drain with a 1"-3/4" galvanized coupler. Can these two metals come in contact? I've read it will create corrosion issues but I can't find the coupler in brass. If the back flow is copper that brings the total to 3 different metal, can I expect any sort of reaction? Thanks

    Jay
     

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    Last edited: Aug 9, 2014
  2. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    They should have a brass 1 x 3/4 coupling, but you have to look in the brass fitting area. If not any good hardware will have one. Brass and copper are completely compatible.
     
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  4. Cygarbuff

    Cygarbuff New Member

    Joined:
    Nov 7, 2004
    Occupation:
    Auto Glass Installer
    Location:
    Tewksbury, Ma
    Thank you. I went to Lowes, Home Depot and True Value Hardware with no luck. I'm just going to go to a plumbing supply house Monday. Thanks for helping and confirming
     
  5. Smooky

    Smooky In the Trades

    Joined:
    Apr 4, 2011
    Location:
    North Carolina
    If I was going to use it for irrigation I would not install a boiler drain with a screw on vacuum breaker. I like the poppet style vacuum breaker because the flow is not restricted. Something like a woodford 101 or similar would work.

    http://www.woodfordmfg.com/woodford/Wall_Faucet_PDF/101Catalog.pdf

    As HJ said above the brass fittings may be in a different area of the store than the boilers drains are located. Sometimes the store associates don’t know the store that well.
    http://www.homedepot.com/s/1x3/4+Brass?NCNI-5
     
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