I bought this with a swivel joint to provide a safer alternative for my ferrets. Yes, it is an unusual reason to purchase but the regular style tubing that is advertised for ferrets is very unsafe with metal that could severely injure an eye or worse. This item provides me with a safe option that also can allow multiple ferrets to play and allows me to make a really long tube for the ferrets and they love the new tubes because they are easier to clean and they can make noise with their nails. It's a great item for larger male ferrets too, they won't get stuck. Plus, the rubber/plastic lining can stand up to even my hardiest chewer.