09/02/2026
If someone quoted you a repipe in PEX, it is worth knowing there are two kinds.
Both are PEX. Both are good pipe. They differ in how they are made, and that changes how they behave in your walls.
PEX-A is the more flexible one. It is joined with expansion fittings: the tubing is stretched, the fitting goes in, and the tubing shrinks back around it. Because nothing is squeezed down at the connection, the fitting keeps close to the full inside diameter of the pipe. PEX-A is also more forgiving - a kink can usually be repaired with heat rather than cut out.
PEX-B is stiffer and joined with crimp or clamp rings. The fitting sits inside the tubing, so the opening narrows slightly at every connection. On a normal house that is not something you would ever notice. It also costs less, and the tools are more common.
Neither is a trick. A good installer can do excellent work in either. The honest answer is that PEX-A costs a bit more and is nicer to work with, and PEX-B is perfectly sound plumbing.
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