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    nelsongkevin's Avatar
    nelsongkevin Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 15, 2015, 09:57 AM
    Plumbing
    Do I have to come off the top of the horizontal drain with my vent or can I roll it down on a 45
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #2

    Apr 15, 2015, 12:04 PM
    Unfortunately, for a vent to be a vent it MUST roll ABOVE the centerline of the drain line... it can roll at a 22.5, 45 or 90 degree angle or just about any angle as long as the center of the vent fitting rolls above the centerline of the drain pipe.

    Mark
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