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Pex-a repair - does the new pex-a specs have to match

skiereric
skiereric Member Posts: 66
edited December 2023 in Radiant Heating
I need to remove a damaged piece of pex-a o2 barrier tubing.
The new section will be 5' long and ends on the return side of a radiator.

Do the specs (O.D, ID, wall thickness) have to be 100% the same, or is there a little leeway?

The existing Pex is only sold in min. of 250' so trying to reduce waste.

Comments

  • mattmia2
    mattmia2 Member Posts: 9,459
    If it is a different ID you have to use a fitting for that ID, either change the fitting on the boiler end or use a coupler that is the 2 different sizes for the splice. It won't seal if the fitting is a different size than the tube. If the new tube is smaller it could restrict the flow too much to properly transfer the heat depending on the specifics of the application.
  • hot_rod
    hot_rod Member Posts: 21,868
    The numbers on the tube tell the story. CTS refers to copper tube size, so 1/2" pex is 5/8" OD.

    SDR 9 is typical for heating and plumbing pex. So any brand fitting or tube should match up.

    Every 3- 5' pex tube should have a string of listing and dimension numbers printed on it.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • GroundUp
    GroundUp Member Posts: 1,868
    1/2" pex-a is 1/2" pex-a. They're all compatible with each other, regardless of brand. Also, you should be able to buy <20ft sticks at pretty much any supply house
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,590
    GroundUp said:

    1/2" pex-a is 1/2" pex-a. They're all compatible with each other, regardless of brand. Also, you should be able to buy <20ft sticks at pretty much any supply house</p>

    But not all PEX-a is O2 barrier. Check the details.
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
    skiereric