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Blue is cold, red is hot, and clear or white is the fresh water tank drain. Fresh water tank drains always have a valve on them to drain. The OP's photo has a cap on the end. It's probably the low point drain for the original residential refrigerator ice maker.
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Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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