A Network entity of a communication network and a network node are disclosed. The storage section is formed of side surfaces, a back surface and an inner bottom surface to define an inside thereof, and includes guide grooves formed along both protruded rim portions at both sides of the storage section. The passage includes a first curved section that has an inlet at the pressure side. Optionally, the female end may include rigid dimples that exert pressure onto the male end to prevent the two pipes from separating.