DWV pipe coupling from 1-1/2" ABS to 1-1/2" ABS?

Discussion in 'Plumbing Forum' started by redwood1922, Aug 12, 2018 at 8:35 PM.

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  1. Aug 12, 2018 at 8:35 PM #1

    redwood1922

    redwood1922

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    I have a tight spot in the attic crawl where a new waste vent for a new sink will go. It would be easier to use 2 neoprene transition couplings for 1-1/2 inch ABS to 1-1/2 inch ABS, if there is such a thing, instead of using ABS adhesive in this position. Is there a Proflex/Fernco/PlumbQuick or Mission part that will do it?

    This is the type of coupling I am talking about but I can't understand Fernco's or Mission's descriptions. The letters ABS do not appear in these descriptions.
    https://www.fernco.com/plumbing/shielded-couplings/proflex-couplings
    https://missionrubber.com/products/band-seal-specialty-couplings/

    Why I'm doing it: I might need to undo it a few times (less than 3-4 times) over the next few years in order to get access to a corner of the house that will be blocked by the new vent pipe. If you tell me I will need to replace the couplers every time they're disturbed, fine. It's true I could try to route it around the access route and use ABS adhesive instead, but there are safety risks in the alternate route. The alternate area is even tighter and there is knob and tube wiring there. I believe it is not practical to rewire.
     
  2. Aug 12, 2018 at 8:42 PM #2

    Gary

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    Use a couple union joints, so they can be unscrewed to remove the section of pipe that would be in your way, for access?
    Your option would work too.
     
  3. Aug 12, 2018 at 8:44 PM #3

    Snoonyb

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    Neither are product specific and because they are neopreme they will last virtually forever, the exception of course, is the threaded clamps, which can be replaced with like products.
     
  4. Aug 12, 2018 at 11:15 PM #4

    redwood1922

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    Thanks for responses. You helped me figure out the part number. Seems to be Fernco 3000-150
    "1-1/2" CI, PL or ST to 1-1/2" CI, PL, or ST "
    "connects cast iron, plastic, steel, copper and tubular, drain waste and vent systems for above-ground applications" [my emphasis]
    They give the Mission equivalent as CP-150
    I suppose I better buy 4, use 2, keep 2 spares. Gary, union joints metal pipe are a good idea, However in this case I want to use ABS, easier to cut, adjust angles, and use adhesive in a space that has plenty of room for pipe but not much room for my body to squeeze into. Local code doesn't allow threaded ABS or not in DWV anyway.

    Holy moly, the torque wrenches for these couplings are like $40 to $120. When the plumber does the rough in downstairs I wonder if I can borrow one. But I might spend the $40 anyway.
     
    Last edited: Aug 12, 2018 at 11:42 PM
  5. Aug 12, 2018 at 11:57 PM #5

    joecaption

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    Why, a vent line should have 0 pressure, a simple nut driver or screwdriver will work fine.
     
  6. Aug 13, 2018 at 1:27 AM #6

    Snoonyb

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  7. Aug 13, 2018 at 1:51 AM #7

    redwood1922

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    Wow Snoonyb, thanks for that Lowe's link for the wrench at only seven bucks!
     
    Last edited: Aug 13, 2018 at 2:05 AM
  8. Aug 13, 2018 at 2:04 AM #8

    redwood1922

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    Yes, it's probably overkill. But, each year we get 1-2 mild but noticeable earthquakes here. Might last longer with torque. Maybe this is the reason local code says ABS joints have to comply with "manufacturer's installation instructions".
     
  9. Aug 13, 2018 at 2:27 AM #9

    redwood1922

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    Gary, I just looked it up and threaded ABS would be to code - for some reason I mistakenly thought it wasn't. So I learned something from what you wrote. I will see if I can find the threaded ABS angles in in the store. I mostly see the press-on/glue-on kind but now I know what to look for.
     
  10. Aug 13, 2018 at 11:04 AM #10

    Snoonyb

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    There is no such animal for ABS.
     
  11. Aug 13, 2018 at 11:17 AM #11

    nealtw

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    ABS[​IMG]
     
  12. Aug 13, 2018 at 11:26 AM #12

    Snoonyb

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    He's talking about threaded unions, and they are not available for ABS.
     
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  13. Aug 13, 2018 at 11:31 AM #13

    nealtw

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    Yes you are correct.
     
  14. Aug 13, 2018 at 2:00 PM #14

    WyrTwister

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    Exactly whay I was thinking .

    Wyr
    God bless
     
  15. Aug 13, 2018 at 3:05 PM #15

    Snoonyb

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    That's fine, except you need a water column, to pass inspection, or you could torque the fitting after they leak, recall the inspection, and ruin the ceiling.
     
  16. Aug 14, 2018 at 10:35 PM #16

    redwood1922

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    Ok now I am just curious. The Calif. Plumbing code has remarks about threaded plastic pipe. Some of the DWV fittings at https://www.plumbingsupply.com/absplasticfittings.html are threaded...what is all that about?
    Plan A is still to do this cockamamie thing with 2 neoprene couplings next weekend.
     
  17. Aug 15, 2018 at 1:58 AM #17

    Snoonyb

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    Yes, there are threaded ABS fitting, but they are limited in application and are generally found in trap arms and clean out plugs, which are visible as well as easily accessed.

    Waste and vent lines are required to be tested with an 8' water column.
     

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