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In response to "the sink does sit on an exterior wall I am sure. I'll try your suggestion as that seems like a good way to isolate the issue. -- nm" by Mel Profit

Be sure you turn on the faucet, then turn off the water under the sink

There will still be some water in the supply line and if you leave the faucet closed that water will be under pressure and spray out when you disconnect the supply line.

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