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Assuming the holes are big enough, another option might be to get pex approved insulation that normally insulates pex tubing. Cut a piece off and jam it in the opening around the pex tubing so it extends an inch or so on both sides of the hole. It would allow the tubing to move due to expansion and contraction and prevent the tubing from scraping on the hole.

I've seen pictures where contractors used pex insulation where the pex runs through holes in wooden wall studs. It allows the tubing to move and protect it from rubbing on the wall studs.

Be sure to only use pex approved insulation to prevent deterioration of the pex tubing.

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