I am getting ready to buy and install a Filtrete brand under-sink water filter, and in anticipation of this task I looked at the water lines under the sink just now. I immediately noticed that the cold water line is a stiff 1980s-era ringed-looking silver type of line (the type that looks like a trachea/windpipe) and I forsee it easily cracking when I start moving it around.
Therefore I am considering replacing that line completely with a length of PEX as part of this job.
My questions are:
1) Is my suspicion on target? Is this line likely to rupture if I start flexing it as the filter installation will no doubt require?
2) Is there anything in particular I would need to know to do that as a plumbing newbie?
3) Videos I've seen about PEX don't make it look like it's very flexible either with regard to doing "C" or "U" curves. Am I wrong about that?
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