September 9, 2014
Never mind - I went to the store yesterday and got the answer. The 1/4 in. PEX pipe is very different from the smaller tubing that uses a 1/4 in. compression fitting. (I THINK the PEX is 1/4" ID whereas the refrigerator line is 1/4" OD.) The salesman talked me into just using copper tubing, which I will do. I had wanted to avoid copper due to the risk of breakage, and wanted to avoid PVC since it makes the water and ice cubes taste like plastic, so PEX seemed like a good alternative. But it would have required a huge collection of fittings to be able to get the PEX to fit on the 1/4" compression fitting, so I decided it wasn't worth the trouble.
p.s. There was an error in the original question. The supply valve doesn't use a 3/8" male NPT, it uses a 1/4" compression fitting, the same as on the back of the refrigerator.
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