Masterline Bungee Tube Rope AttachmentThis is a bungee style rope that connects to your boat then to your tube rope.. Masterline Bungee Tube Rope Attachment This is a bungee style rope that connects to your boat then to your tube rope, this bungee effect helps in rough water by taking the jar of the tube as well as protecting the tube from damage caused by slack rope suddenly pulling tight. It also helps slingshot the tube out of the water on starts for a smoother ride.