So what would the measurement on this copper pipe be? I’ve bought 3/8 and 1/2 in…

So what would the measurement on this copper pipe be? I’ve bought 3/8 and 1/2 inch compression fittings and neither fit! … UPDATE::: I’ve been to the hardware store multiple times and they have nothing that can help me (3/4 and 1/2 compression and shark bite won’t fit) … He says it’s 7/16 ID


So what would the measurement on this copper pipe be? I've bought 3/8 and 1/2 inch compression fittings and neither fit!…

Posted by Cindy Chebultz on Friday, April 19, 2019

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Posted by: Cindy Chebultz

29 replies
  1. Scott Kelly
    Scott Kelly says:

    Check to see if the end has flared out a little when the were cut. It happens when the cutting wheels are dull. It looks like 1/2” copper to me which is 5/8” OD

  2. Mark Clark
    Mark Clark says:

    1/2” OD. Just wet through this process. Found the propper fitting at menards. There is one fitting that will go from 1/2”OD to 3/8” male compression for your faucets. OD is key.

  3. James Stray
    James Stray says:

    Tube is measured OD pipe is measured by the ID but over time copper can swell from pressure or temperature so you’re left somewhere in the middle

  4. James Nordstrom
    James Nordstrom says:

    If ithasswelles from freezing you can get a sledge tool from aairconditioning.supply store and stage the copper and solder a new piece; that will then accept the compression fittings

  5. Saxton-Wiley Boats
    Saxton-Wiley Boats says:

    So, this Cindy from an old plumber. It the copper was ever frozen they could have expanded. Copper will do that and then nothing, fottings fit on it. In residential you have to cut it back until you find where it hasn’t. On board or in marine use. I DONT KNOW.

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