Abstract: The present invention relates to an air vehicle (V); a body (2) separating the areas on the air vehicle (V) from each other; a plurality of pipes (3) located on both sides of the body (2) in connection with the body (2), which allow fluid to be transferred therethrough; an opening (4) located on the body (2) so as to provide fluid passage between the pipes (3); a plurality of fasteners (5) that enable the pipes (3) to be connected to each other and/or to the body (2); a flange (6) that extends outward from the pipe (3), allowing the fasteners (5) to be placed thereon; at least one sealing element (7) located between the flange (6) and the body (2), which provides sealing during the passage of the fluid between the pipes (3); a first pipe (301) and a second pipe (302), which are connected on the body (2) in an opposed manner such that the opening (4) is therebetween.