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

    Jun 17, 2009, 11:10 AM
    Drain line vent. Where? Why?
    Where is the proper location to install a vent in a bath tub drain line?

    Is a vent necessary? What is the real purpose of the vent?

    Thanks in advance
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Jun 17, 2009, 11:26 AM
    Where is the proper location to install a vent in a bath tub drain line?
    You take the vent off just downstream from the trap.
    Is a vent necessary?
    all codes mandate that every fixture that has a trap must be vented.
    What is the real purpose of the vent?
    Let me explain about vents. When you pull a plug or flush a toilet the water going down the pipe sets up a suction. This has to be relieved by outside air. Hence a pipe through your roof. If the vent is blocked by a birds nest or a dead critter the water will pull suction through the nearest trap and you will hear a gurgle. It may be a fixture trap or the toilet may talk to you but you will hear it someplace. While it is possible for the suction to pull enough water out of a trap to have sewer gas escape but it's more likely a smell will come from decaying food, grease or hair. . And now you know about vents.
    Good luck, Tom
    holtzheimer's Avatar
    holtzheimer Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jun 17, 2009, 11:54 AM
    Thanks Speedball! (Tom)
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #4

    Jun 17, 2009, 01:13 PM

    Tom is so right. If you want to do an experiment pop the top off a pop bottle and turn it completely upside down, do you want a toilet to flush like this?
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