House drain pipes that is. I am a landlord and have had a long time problem that was resolved the other day. We have a sink drain that has been blocking up for 4 years. Its after the garbage disposal and before the can trap in the basement where the problem is. We would snake it out once a year or so and move on. This time it was really blocked so i cut the pipe to find out what was going on. The sawzall cut through the first cut no problem...but the second was giving me all kinds of problems. I finally got through and found this inside! Both were cut in half. Problem solved. These had been in there a long time as there was no way they would have made it past the garbage disposal. Never a dull day.