I walked by a neighbor's house today where a 4-inch drainage system is being laid in to handle the flooding in her back yard, At the street where the pop-up drain (UGH! hate 'em) is being installed, the crew is using DUCT TAPE to join the black corrugated pipe to the white PVC up elbow. I don't see how this can be acceptable on any professional level, but then, I've been wrong before. I called the contractor, and he says, "Well, ah bin doin' that way for 27 years and had no complaints." My takewaway from that is simply that he's doing it a 27-year-old way. Your thoughts, please.