Backflow Preventer Sizing

Discussion in 'Irrigation / Sprinkler Forum' started by sgwynn, Apr 5, 2005.

  1. sgwynn

    sgwynn New Member

    Messages:
    2
    Greetings all! I had a backflow device (Zurn 975 XL) installed for an irrigation line. The line is 3/4" and the backflow device is 1". Is there any problems with this setup?

    Thanks much.
  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,401
    Location:
    Yakima WA
    No problems.
  3. sgwynn

    sgwynn New Member

    Messages:
    2
    Would there be any advantage to it? I.E. better pressure or maybe he only had a 1" on hand?
  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,401
    Location:
    Yakima WA
    I can't see any advantage, but it certainly won't be a problem with pressure or volume.
  5. trishr

    trishr New Member

    Messages:
    1
    Location:
    Manitoba
    Hi am new to this site and have a question about a flood guard preventer for the sewer in my basement. I purchased a new 3 inch to replace the existing old 3 inch one; however, I was about to install it and found that it is about 1/2 inch too narrow and will fall through the drain pipe. There are four screws but they do not seem to do anything (i.e. thought they might enlarge the rubber ring to fit snugly against the pipe wall but nope. A 4 inch would likely be too big - any suggestions are there actual adjustable flood guards available (am in Manitoba Canada)? Thanks
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