2.5" ABS, DO FITTINGS STILL EXIST?

Discussion in 'General Plumbing Help' started by karl olsen, Mar 16, 2019.

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  1. Mar 16, 2019 #1

    karl olsen

    karl olsen

    karl olsen

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    Howdy, I've come upon a missing link. I'm remodeling a bathroom, and the toilet vent is 2.5" ABS. Did companies stop making these fittings? Just too odd of a size? I'm only replacing the pipe through floor and hooking back up to old "Y", don't want to have to run new 2" all the way through roof.
     
  2. Mar 16, 2019 #2

    Mikey

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    The OD of 2" ABS is actually 2 3/8", so it might look like 2 1/2" to the untrained eye.
     
  3. Mar 16, 2019 #3

    karl olsen

    karl olsen

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    See thats the issue, i am a well trained eye. 17 years pipefitting in shipyards and refineries. OD is 2 7/8", 2 1/2" pipe. I've looked at my local hardware stores, even online. Find nothing out in the world for this size. goes from 2 to 3 with the half missing. So I'm just wondering if it was eliminated for some reason? was thinking of using a rubber coupling, it's in a wall but shouldn't ever get water that high up.
     
  4. Mar 17, 2019 #4

    ExtraMilePlumbing

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    Go with the rubber coupling, i never had to work with 21/2”abs
     
  5. Mar 17, 2019 #5

    karl olsen

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    Thanks mister. Just find it weird that a whole size seems to be gone. Improvise adapt overcome.
     
  6. Mar 17, 2019 #6

    Diehard

    Diehard

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    Transition to 2-1/2" PVC
     
  7. Mar 18, 2019 #7

    frodo

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    Measure the od and id of your 2 1/2'' pipe and see if it fits into a 3'' or a 2'' fits into it


    [ATTACH abs__pipe_deminsion_.png =full]20245[/ATTACH]
     
    Last edited: Mar 18, 2019
  8. Mar 18, 2019 #8

    Diehard

    Diehard

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    Not sure what you are saying with these pipe sizes, etc.
    ABS dimension's are the same as PVC.
    Those ID's you show are incorrect.(I believe you subtracted only one wall thickness.)
    The only way you could get close to matching an OD of one size to the ID of another (or vice-versa) would be with different schedule pipe. And even then may not match properly to allow gluing it.
     
  9. Mar 18, 2019 #9

    frodo

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    I disagree, a 3'' fitting fits inside a 4'' pipe
    4'' inside 6
    etc etc
    there are many combinations, that you are only aware of if you are hands on
     
  10. Mar 18, 2019 #10

    Diehard

    Diehard

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    Too vague!
    Are you talking OD of a bell/socket end of a fitting?
    Are you talking specific pipe schedules?
    Are you talking a fit that can be glued?
    PVC Dimensions.jpg
     
  11. Mar 18, 2019 #11

    frodo

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    A sch 40 pvc -3'' fitting, will fit into a 4'' sch 40 pipe
    A 3/4 fitting will fit inside a 1 1/4 pipe

    and is tight enough to glue

    there are other combinations also
     
  12. Mar 18, 2019 #12

    Diehard

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    Okay...now you're being specific enough so I know what you're talking about. Wasn't able to get that from your first post where you were comparing pipe ID's & OD's.

    But I still don't understand why try to make transition with OD's of ftgs when 2 1/2" PVC (sch's) appears to be available.
     
  13. Mar 18, 2019 #13

    frodo

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    if they are available then post a 2 1/2'' x 2'' reducer abs/sch 40
     
  14. Mar 18, 2019 #14

    Diehard

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    Lost me again. Why a reducer to 2".
    He said he had 2 1/2" and didn't want to have to run 2".
    We're just talking new 2-1/2" PVC connecting to existing 2-1/2"ABS.

    He may have already done it by now.:D
     
  15. Mar 18, 2019 #15

    frodo

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    the answer is simple. they are not available
     
  16. Mar 18, 2019 #16

    Diehard

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  17. Mar 18, 2019 #17

    Mikey

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    Here you go:
    https://www.fernco.com/dimensional-drawings/1056-25022

    Not shielded, so I think it must be accessible, but your local AHJ can tell you for sure.

    From the Web, italics mine: "Fernco (Rubber) fittings are not approved in wall framing unless they have a metal sheathed hose clamp assembly covering the entire fitting as part of the design, Which limit them to straight couplings or reducing couplings. The reason is that vermin can chew through the rubber."

    I haven't found a shielded 2" - 2 1/2" coupling yet, but you might be allowed to add a stainless steel shear ring to the unshielded coupling, which would not result in an an as-designed assembly, but I'd bet most inspectors would approve it:

    https://www.fernco.com/plumbing/shielded-couplings/stainless-steel-shear-rings
     
    Last edited: Mar 18, 2019
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  18. Mar 18, 2019 #18

    frodo

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    DWV !!!!!!!!!!!!! pressure fittings are not allowed in a dwv system
    they are for hooking up the well

    We have to install by code.
     
  19. Mar 18, 2019 #19

    frodo

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  20. Mar 18, 2019 #20

    Diehard

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    I'm getting a bit dizzy. I think I'll call it a day.
    thanks.jpg
     

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