I have heard a few people say that there is a company who produces flexible MU hoses but I have not been able to find them. I have built 7 sets using the rubber coating off of 16 gauge wire but this is very tedious. I know Ozark Miniatures produces the train line hose but I don't think they sell the cluster of three (or 4 for that matter). If anyone knows a company who makes these, or has a better way to make them, please let me know. Thanks.