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Pex fitting going bad?

JPL941 Member Posts: 51
Hello, I was snooping around my house the other day and I found that my pex fittings some hot/cold look like they’re going bad, And it seems like they are the copper crimp fittings. The stainless steel ones still appear totally fine.

Attached is a still picture from a video of a fitting that feeds my master bath sink and toilet. Without pulling up the floor or tearing into the ceiling, I’m not quite sure how to fix it. It’s very narrow spaces I accessed from the tub access and I’m debating evopex fitting since it’s shark bite pex and permanent. What would you do to fix this? Brass? Plastic? Stainless if you had more room for tools?

This fitting by far looks the worst but many already have some discolored copper and I believe mineral deposits.

Disclaimer, I didn’t do the work, I bought the house like this so I don’t know if things were checked after each fitting. I think the pex was installed in 2010.



  • STEVEusaPA
    STEVEusaPA Member Posts: 6,127
    It seems to me like they are simply leaking, maybe just not properly crimped/installed had a minuscule leak.
  • mattmia2
    mattmia2 Member Posts: 7,708
    Propex if it is pex a tubing, but it probably isn't.

    Propex inherently crimps itself properly if you don't over-expand it, just need to cut the tubing square. You can move the tubing to a position where you can access it with the tool, expand it, then move it to its final position on the fitting.
  • hot_rod
    hot_rod Member Posts: 19,260
    Look like that one ring was not crimped properly? The tool only crimped part of the ring by the looks of it.

    Copper Pex rings have been around 35 years or more, properly installed on tube that is in spec they should be just fine

    Expansion type fittings with composite materials for the fittings seem to have the best performance, larger ID.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • weil_fail
    weil_fail Member Posts: 81
    it seems like there is a lot of moisture around it. could be leaking itself, but also could be something near it leaking or condensing. maybe wrap it in saran wrap and see if water builds up underneath.
  • JPL941
    JPL941 Member Posts: 51
    Thank you all for your responses. Agree it probably wasn’t crimped correctly. Everything is dry between the floor. No leaks, no moisture noted. Looked up potable shark bite tubing and it’s pex b. Now if this was your house, how would you fix it? In order for me to get that picture took a lot of bending I never knew I could do. The phone caught the images, I couldn’t visibly see it. If I can’t get a crimper in there would you use a shark bite due to the tight spot or would you rip up floor or ceiling? Better yet, would you just leave it alone? Could it break off at any point?