My father and I have been re-wiring our home's telephone lines, and in doing so, we found these components attached to loose wires.

Mystery Components

They are both labelled "3M". One says "C22" and the other says "B27".

I think they might be end caps for the wires, but we've never seen anything similar. Does anyone know what they are?

  • look carefully at the inside, there should be place for two wires and then contacts inside there that cut into the wires when the red button is pushed down
    – PlasmaHH
    Jan 10 '16 at 23:27
  • 1
    @PlasmaHH: Those look like triples to me.
    – Ignacio Vazquez-Abrams
    Jan 10 '16 at 23:28
  • These things and lever-nuts serve same purposes.
    – Nick Alexeev
    Jan 10 '16 at 23:45
  • Ridiculous migration are you kidding?
    – cde
    Jan 10 '16 at 23:59
  • 1
    Not wire nuts at all. IDC butt-connectors (stay out of the gutter, please), or specifically, being 3M, Scotchloks solutions.3m.com/3MContentRetrievalAPI/…
    – Ecnerwal
    Jan 11 '16 at 3:20

They are used to splice (unstripped) wires together. They contain a small piece of metal that joins the wires when the colored part is compressed, as well as some containing a gel that insulates the wires from the elements making them suitable for outdoors use.

  • Alright, that makes sense, but why would there only be one wire in each of them?
    – Phinet
    Jan 10 '16 at 23:32
  • 2
    So that you don't have a wire exposed at the end.
    – Ignacio Vazquez-Abrams
    Jan 10 '16 at 23:32
  • I don't follow. You said they're for splicing wires together, but there's only one wire. Were they just used for an unintended purpose?
    – Phinet
    Jan 10 '16 at 23:35
  • 3
    They're usually used for splicing wires together. They can be used to cap off a single wire. They aren't exactly expensive if you know where to get them.
    – Ignacio Vazquez-Abrams
    Jan 10 '16 at 23:37
  • The wire sticking out shows it's been used previously and discarded. Some one had been working there in the past and made some splices.
    – ojait
    Jan 11 '16 at 1:05

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