Without delving too much into it, I also think I've found it by the low point drain, toward the front tire, on my Cottage. I saw a red and a blue line with caps on them, and I also saw what looked like a white pex line about the size of an ice maker water tube. I'll look closer later, but we down at the seasonal site to do something else.
We've decided not to use the icemaker anyway. Our overall water quality is not good, so we'll bring water gor the dogs from home anyway. I might even get a culling an 5 gallon water bottle system. Anyway, we also have a small countertop ice maker. That works really good. Let that do its thing with good water, fill the inside bucket, and I don't have to worry about winterizing that tube or appliance.
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