An easy folding water pipe device includes an inner tube, an outer tube and a connector structure. The outer tube wraps around an outer circumference of the inner tube and consists of a first wrapping portion and a second wrapping portion with different modulus of elasticities. The connector structure has a first connector and a second connector, and the first and the second connectors respectively connect to two ends of the inner and the outer tubes. When the water pipe device is stretched by an external force, the first wrapping portion, the second wrapping portion and the inner tube are stretched simultaneously, and when the external force is released, the first wrapping portion is in a contracted state, causing the outer and the inner tubes to wind regularly. Therefore, the present invention has advantages such as easy folding and preventing tangling.

A lining tube for reconditioning a defective sewer pipe has an inner film tube, around which is disposed a radially expandable layer of fiber material that is impregnated with a curable reactive resin. The inner film tube has a connecting section that extends in longitudinal direction thereof and connects two circumferential portions of the inner film tube that run parallel to one another to give an inner film tube which is continuous over its circumference and has a defined nominal diameter. The connecting section has an intended fracture site that extends along the inner film tube and can be parted by introducing a pressure medium into the inner film tube in circumferential direction, in order to expand the inner film tube and the layer of fiber material disposed thereon radially beyond the nominal diameter. There is also described a method of producing and of installing such a lining tube.