How close to the end can you cut copper stub-outs for a compression fitting?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rossn, Nov 30, 2019.

  1. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    Hello,

    I am installing some radiators, and using the Uponor 3-1/2 x 8 ProPex copper stub-outs (https://www.supplyhouse.com/sh/control/product/~product_id=LF2865050)

    I'm a little tight on length, and may need to get longer ones, though timing would not be ideal.

    How close to the end of this stubout can I safely cut for a compression fitting? 5/8"? 3/4", 1"?

    terrylove_stub-out_cutoff.jpg
     
  2. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    Maybe 1-1/16" is a as close as I can practically get, based on my tubing cutter guide-wheel, since the discolored section bumps out slightly.

    terrylove_stub-out_cutoff-2.jpg
     
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  4. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I am not a pro. I was thinking 3/4 after looking at your first photo, but you make a good point on the cutter roller.

    I like the Ridgid 101 "tubing cutter" for copper. It is compact. I don't know if it has a narrower roller. You can use a fine-blade hacksaw, and then clean it up.
     
  5. mliu

    mliu Active Member

    Joined:
    Feb 7, 2007
    Location:
    Colorado
    You don't have to use a rolling tubing cutter. If you really need to get as much length as possible, use a fine-toothed hacksaw just inside the heat-colored band. As long as the tubing is straight and not bulged, the compression fitting will slide on. You can wrap a piece of masking tape around the pipe (on the inside of the cut line) as a cutting guide. Saw gently so you get a straight cut and so that your saw doesn't jump out of the cut and scar the sealing area of your compression fitting.

    Remember: If cutting with a hacksaw, you absolutely MUST deburr the inside and outside of your pipe, and you MUST flush out the copper chips (swarf) from the pipe before installing the angle stop valves.
     
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