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Thread: Backflow Preventer/Anti Siphon Valve

  1. Print this Post   #1
    Junior Member
    Join Date
    Oct 2008
    USA - NC

    Backflow Preventer/Anti Siphon Valve

    Hi I'm new to the forum. We have a Bighorn 3600R/L 5th Wheel.
    When flushing our black water tank, we suddenly heard water gushing inside the wall near the door. I shut the water off and after cleaning up finally found the source. The top of the Backflow Preventer/Anti Siphon Valve had come off. This is a fitting that the plastic flush line screws onto and has a vertical plunger and a horizontral ball and spring.
    I can't find a replacement part!! The fitting is labeled R&B Model 571 110F 125PSI 1/2"

    Any help locating a replacement part would be appreciated.

  2. Print this Post   #2
    Committed Member truknutt's Avatar
    Join Date
    Sep 2007
    USA - PA

    Assuming you have tried your dealer and/or Heartland Customer Service.....

    If you have the San-T-Flush system, try Swan Industries (

    To view their setups:

    TrukNutt & Co.
    (Dave, Nona, Buddy, Sienna, Maverick & Salem)
    U.S. Army, Retired (x2)
    2009 Cyclone 3210LE Full Throttle ("Beauty") w/5th Airborne Pinbox, Reico-Titan System w/SnapPads & Voyager Wireless Backup Camera
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    2004 EZ-GO Gas Golf Cart ("The Li'l Beast")
    1997 Harley FLHTCU (Retirement Present)
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    2009 NAHOC Rally / PAHOC Rally
    2010 NAHOC Rally / NYHOC Rally / Hershey RV Show / PA, Not really a Rally,Rally
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    2012 PAHOC Rally / NYHOC Rally / Hershey RV Show
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  3. Print this Post   #3
    Past British Columbia Chapter Leader sailorand's Avatar
    Join Date
    Dec 2005
    CAN - BC

    I had to replace my anti siphon valve last year. Got it from a plumbing dealer for $96. Solid brass to boot. Home depot did not carry it in Palm Springs.
    BC Chapter Rep.
    Love it and would buy it again. 2006 Bighorn 3055, serial # 2808
    Chev 2500 extended cab, Duramax LLY, Silver Birch, 4x2
    Allison 6 speed, Tekonsha Prodigy
    Ladner B.C. Canada
    VE7HRA / K7HRA
    Kenwood ts2000, Scorpion motorized vertical antenna
    Past BC Heartland Chapter Leader Club #1012

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