Posted 3/28/2017 06:47 (#5927453 - in reply to #5927059) Subject: RE: WARNING!!! Drain Tile Plastic Tubing Pics Must See
No this is not Springfield Plastics Pipe. This looks like the old Domco Pipe. That protrusion is the vent tube that is used in the manufacturing of Dual Wall Pipe. It lets the trapped air inside of the corrugation cool down faster.
For those of you that think recycled resin is ok in your pipe, think again.