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Thread: Water in P Trap - Adequate Siphoning Test

  1. #1
    DIY Senior Member chefwong's Avatar
    Join Date
    Jun 2006
    District of Columbia

    Default Water in P Trap - Adequate Siphoning Test

    4 weeks till the cabinets arrive for the kitchen.
    I have a suspectiable issue with my vent .....

    From the stub, can I install and P trap and pour water into it.
    If by week 3, no water disappears and everyone in the house is still using the rest of the houses *plumbing system* is it safe to say that I don't have siphoning issues with my layout ?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    In three weeks, depending on conditions, it could evaporate...not necessarily a good test. Now, if it gets sucked dry in the first week or so - you've probably got a problem. This will do nothing to tell you about other traps that might have a problem when water runs down that trap.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default trap

    Not necessarily, even if it does not evaporate. Most siphoning issues are caused by the sink itself when it drains, and to test that you would have to have the sink connected and be using it.


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