When we purchase a connection to the tube, it is important that it is the same size which it’s installed. The junctions, as well, have to be chosen according to the place in which they have to connect the tubes, so we can choose between hydraulic connections at L, To the right as well. Connections could be of various types too, regarding the use. And that’s why we can choose the overtake curve when we have to cross the tubes or the receptacles needing to connect tubes which cannot be rotated. Two sides ways change according to the chance that occurs, so it’s possible to choose between female-female and female-male. According to the material of the tube, the connection to apply can differ in their characteristics and kinds.