Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Compression vs press fittings for Pex-Al-Pex

I'm installing radiant heating with Everhot Pex-Al-Pex tubing and they

say that I can use either compression or press fittings. Does anyone

know which is better and why?

Also, does anyone know how bad a scratch on a pex-al-pex tube has to be

before its unusable? The manufacturer says stuff like, "don't step on"

and "don't scratch" but installing it seems impossible to not get it

scuffed up a bit. I was wondering if anyone knew what kind of scratch

was too much?


  • Simply Rad
    Simply Rad Member Posts: 184
    Pros and cons

    Neither fitting style is better.  I use both and they both work well.  Crimp is more permanent, but sometimes harder to use the tool in tight spaces.  Compression is nice for a service stand point it can be used as a union.  I like to use semi-permanent lock-tight on compression threads when i cover them up, to eliminate the loosening of threads from expansion and contraction. 

    As for the scratches?  I have used PAP for 10yrs now and I have not thought to much about scratches, more so I worry about kinks, cuts and holes.  I like PAP because of the lower expansion rate, closer to copper than PEX, which ensures a quite system operation.  Also i like the fact that the pipe holds its form and does not wack you in the face.  Also, looks nice cuz you can make it straighter than pex.


    Jeffrey Campbell
This discussion has been closed.