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Thread: Fitting for change in direction

  1. #1
    DIY Junior Member yan2hua's Avatar
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    Default Fitting for change in direction

    Hi,
    See the attached plumbing codes, 2006 IPC allow Wye & 1/8 Bend for Horizontal to Vertical connection and 2009 NSPC doesn't allow. Does any one know if 2009 IPC has changed this ?
    Thanks
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    The TYPE of horizontal to vertical connection is what determines whether the combo or a Yand 1/8 bend can be used. In either case, if the horizontal line is a "trap branch" without an intevening vent, it REQUIRES the sanitary tee or fixture fitting, otherwise you can use any fitting you want to. Note #2 of the UPC and Note "C" for the IPC cover this. THe codes are a "minimum standard", but you can exceed them if desired, as long as you do not violate a "mechanical limitation" for its use.

    Here is a nice link to Bert Polk's plumbing tips
    Last edited by Terry; 04-05-2012 at 12:36 PM.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member yan2hua's Avatar
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    One case is: see the attached drawing, 1-1/2" vertical PVC 6 feet up to a grill box with a Mini Studor on the top, only one kitchen sink, what kind of connections will meets the code. Also please see the drawing, is that all the fig meets the code. Name:  Is this configuration meets the code.jpg
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  4. #4
    Plumber jimbo's Avatar
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    Isn't a " wye + 1/8 bend" the same as a "45º elbow + 45ºwye"

    Note that neither of those, or the LR combo, can be used to connect a trap arm.

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    Forum Admin, Expert Plumber Terry's Avatar
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    A kitchen sink uses a 2" waste line, 1.5" vent and 1.5" trap and trap arm.

    Q1 would need a Santee on the vertical like that.

    Here is a nice link to Bert Polk's plumbing tips

  6. #6
    Moderator & Master Plumber hj's Avatar
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    WHERE the vent is in relation to the trap and its connection to the plumbing system determines which fittings will be acceptable. IF the vent were in the horizontal trap arm, BEFORE it connected to the vertical pipe, then you could use any fitting you wanted t to connect it. But in your picture the vent is AT the connection, therefore only a sanitary tee, or back to back fixture fitting for two sinks, would be acceptable. A Y-1/8 bend is usually a single fitting called a "combination" or combo for short. An 1/8 bend with a Y, ( or a Y and separate 1/8 bend), does the same thing, but gives a degree of flexibility while taking up more "space".
    Licensed residential and commercial plumber

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