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I have this wierd ass waste line of some sort coming down the center hall wall of my brownstone. It looks like it may have connected to a bathroom/sink in the center of the top floors. My question is i just went in the basement and sawa TON of giant roaches around that old waste line. im guessing the line is open at one end in my wall and the fellas are feasting on unlimited water while hanging out around a nice cozy boiler in these freezing cold temps. Anyone ever seen one of these random pipes in their wall? My roach theory sound plausible? How can i kill these giant mofos?