Hello, Just a friendly warning on using PVC Drainage Tubes for ferrets. There have been incidents of ferrets being injured when toes, nails, or even legs slip through the holes in the tubes. I had one little guy get his nail injured from one of the holes. They just get to rambunctious for their own good and don't pay attention to the holes. I got rid of mine right after that. Take Care All JoAnn McBride Ferret Friends, Tucson [Posted in FML 5996]