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What happens is that as the moist warm air rises through the sewer vent, it eventually goes through an area that is cold. If it is cold enough, the moisture condenses and freezes on the inside of...

I've been dealing with this winter. I took a coffee can and made a hole in the end of it to fit my vent pipe. I put the can over the pipe. My vent pipe is such that the coffee can is almost the...