These plastic culverts are the same length, same diameter, and same wall thickness as the metal culverts. They do not have a seam. If they were not made by Lionel, someone went to a lot of work to make them and they still do not work with the 345 culvert unloader.
Could they have been made for the 342 only or for a later model culvert accessory? KOOLJOCK1, I am not disagreeing with you. It just seems like a lot of work to make something that doesn't work with this accessory.
Thanks