I have had a problem with those supply lines.
I had one of those woven nylon supply lines burst behind the shower in my 2011 Kodiak. The faucets in the kitchen and bath used pex all the way to fixture. In the shower control they used the supply lines that are flexible like you see in a house for the last 22”. However, the supply line manufacturer has a label on it that says it should be inspected monthly and not installed in an enclosed area, exactly what was done. It also recommended replacing annually. The hot side is the one that failed while my wife was taking a shower. You can imagine the mess it made before I could get the water shut off, we were on city water, so lots of flow. By the way, I never hook up to City water without a regulator. We had the repair man run pex all the way to the shower control as well as installing 90s to relieve any stress. With the way things are hidden in these rvs, I don’t think these fexible lines should be used at all.
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