Most hardware stores have braided water lines of various lengths that will fit your connections. I use one that is long enough to form a loop behind the toilet so I could install a sprayer "T" in the line and not stress the pex fittings. They come in different size connections, so make sure you know what size you need or take the fitting off and take it with you to the store. The braided lines are mostly used to connect household toilets to their water shutoff valves. They are not expensive.
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