hillegom: "I am not a plumber, and do not have this pex. However, if it is in a house as a water line, does it not have to withstand 125 psi? Thats well below anything my pumps put out.
Maybe with thin walls, it might kink?"
Pex does not have thin walls that will kink and I don't think you have any pumps putting out 125 psi of water pressure.
Pex pipe should be fine to use, but why and how? It is not rigid or very flexible and most of the fittings that are used in houses with Pex pipe are copper, so obviously no good for reef tanks.
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