PVC pipe labeled DWV vs Drinking

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Jake_homeowner, Feb 26, 2007.

  1. Jake_homeowner

    Jake_homeowner New Member

    I am setting up a chlorine injection system and retention tank and the 1 1/4 inch PVC pipe I purchased at the local hardware store is labeled DWV. The 1 1/4 pipe only needs to run about 2 feet between the injection tank and the retention tank. Does it matter that its not labeled Drinking like the rest of my 1" PVC supply pipe or is just labeling. This is on a well system running between 40-60 PSI.

  2. leejosepho

    leejosepho DIY scratch-pad engineer

    The pipe you have is something like "schedule 20" for "drain, waste and vent" and is not adequate for pressure service.
  3. kordts

    kordts In the Trades

    exurban Chicago
    You need pressure pipe, they have it at most hardware stores.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Cave Creek, Arizona

    It is probably not "schedule 20" especially if it fits 1 1/4" fittings, but it is schedule 40 in size, but not strength.
  5. markts30

    markts30 Commercial Plumber

    Phoenix, AZ
    DWV pipe is not rated for pressure and will rupture if subjected to it.
    In the case of PVC, Co-Extruded DWV pipe has a foam core and only 2 thin layers of solid PVC - inner and outer...
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