Systems for leaching liquid waste, particularly waste water. More particularly, a cylindrical conduit or pipe for use in leaching systems. Even more particularly, a cylindrical conduit which has apertures/skimmer tabs created either during the manufacture/forming/extrusion of the conduit or by punching after the forming of the conduit. Most particularly, is an apparatus and method for perforating corrugated plastic pipe or smooth walled plastic pipe while the pipe is in the process of extrusion. Further and even most particularly, an actuatable perforator/skimmer tab former which may be timely acutuated to cause the perforation of the wall of pipe wherein the plastic of the portion being perforated is semi-molten as, for example during the forming of the pipe or caused to be made semi-molten after formation of the pipe such as, for example, by heating of the acuatable perforator/skimmer former thereby causing the plastic to be rolled rather than cut creating thereby a perforation and skimmer tab of predetermined and selected geometry and dimension.