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    Islands's Avatar
    Islands Posts: 1, Reputation: 1
    New Member

    May 20, 2007, 07:03 PM
    Bath sink won't drain, pipes clear
    We installed a bath sink that repaced similar one... older house, sink drains into floor not wall... has a "s" pipe, as before, but now won't drain after water runs a minute... then it gulps and a bubble comes out. Then drains very very slowly. Help!?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,379, Reputation: 2280
    Home Repair & Remodeling Expert

    May 20, 2007, 09:22 PM
    I don't know what you could have done but it sounds like your vent is not clear. The gulps is air bubbling back. Remove your S trap and try some rodding about 4-6 feet with an auger. S traps are now illegal but you get to keep yours, grandfathered.
    iamgrowler's Avatar
    iamgrowler Posts: 1,421, Reputation: 110
    Ultra Member

    May 20, 2007, 09:24 PM
    Quote Originally Posted by Islands
    we installed a bath sink that repaced similar one....older house, sink drains into floor not wall..........has a "s" pipe, as before, but now won't drain after water runs a minute....then it gulps and a bubble comes out. then drains very very slowly. help!!??
    Does the new sink have an overflow?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber

    May 21, 2007, 06:56 AM
    If you've installed a "S" trap then it's venting through the trap,(your gulp and bubble). Try installing a AAV,( Air Admittance Valve) just after the trap. Cut in a tee in the vertical drain coming out of the "S" trap and install a streel ell facing up. You my now instal a AAV on the street ell. This will vent the lavatory and relieve the suction that's stopping the flow. Good luck. Tom

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