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    b44m16c10's Avatar
    b44m16c10 Posts: 2, Reputation: 1
    New Member
     
    #1

    Jun 27, 2009, 08:20 AM
    Under the counter drain vent
    What is a under the counter air vent ? How is it installed ? What is the use of this item ?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #2

    Jun 27, 2009, 08:39 AM

    Are you asking about an air admittance valve (AAV) ? If so, install on the horizontal lateral line between the wall and the trap. An AAV is not going to work for decades so it must be accessible. All fixture need a trap and traps need a vent to allow air to enter the system otherwise water would not drain properly. To see how water drains without a trap turn a pop bottle upside down and watch how it chugs
    b44m16c10's Avatar
    b44m16c10 Posts: 2, Reputation: 1
    New Member
     
    #3

    Jun 27, 2009, 08:48 AM
    Quote Originally Posted by ballengerb1 View Post
    Are you asking about an air admittance valve (AAV) ? If so, install on the horizontal lateral line between the wall and the trap. An AAV is not going to work for decades so it must be accessible. All fixture need a trap and traps need a vent to allow air to enter the system otherwise water would not drain properly. To see how water drains without a trap turn a pop bottle upside down and watch how it chugs
    Thank you for your answer on this matter it will be put to good use THANKS
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #4

    Jun 27, 2009, 11:58 AM
    Quote Originally Posted by b44m16c10 View Post
    What is a under the counter air vent ? How is it installed ? What is the use of this item ?
    A under the counter air vent or AAV/ Air admittance Vent(see image) takes the place of a regular vent through the roof. It's mounted just downstream from the trap. Do you need more information? Regards, tom
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