A coupling for a tube includes an attachment and a housing. The attachment is attached to the tube and has a barrel-shaped exterior surface. The housing contains the barrel-shaped exterior surface such that the attachment is rotatable in the housing while not being removable from the housing. The coupling thereby allows easy rotation of the tube within the coupling. The coupling may be utilized to attach the tube to another tube or to another structure.

A pipe includes at least one first section connected to a second section by a hinged element allowing a predetermined angular movement of the first section relative to the second section under a predetermined minimum force. The hinged element includes two end pieces connected respectively to the first section and to the second section and hinged with each other to allow the angular movement, and a tube having ends connected to the end pieces so as to be elastically deformable under the predetermined force according to the predetermined angular movement. The sections and the end pieces themselves are rigid under the predetermined minimum force. A treatment facility include such pipes.

A method of using a hose coupling device is disclosed. The device is an improved hose coupling that allows the hose to move more freely than a traditional coupling. The hose coupling device comprises a sleeve component with a female hose thread on one end and a male hose thread on the other end. The sleeve component further comprises a bearing above and below an O-ring water seal. The hose coupling component rotates independently from the hand nozzle component and eliminates the twist/kink of the hose when walking around spraying water.

Disclosed herein are examples of playless hinge designs formed in a tubular member and methods of making playless hinge designs. The playless hinge designs may, for example, be formed in a tubular member in an articulable tube assembly (e.g., medical instrument), and may exhibit reduced axial and/or tangential play when being articulated.