Thanks for info on the rubber trap.
I do winterize plumbing in the the living area. The washer drain is rather difficult to get at, otherwise I would have put antifreeze in it. The temperature at knee height in the basement never goes below freezing. The washer drain is slightly below the sill which is above ground level- probably why it froze. I should place a thermometer with min/max reading next to the trap to see how low the temperature goes. We're probably past the average low temperature for this year. Maybe next year.....
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