Adapter designed to connect fluid pipes serving to conduct a flowing fluid, said adapter comprising: - a first connection nozzle, particularly tubular, wherein a free end (11+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, particularly enclosed by a connection flange, said fluid pipe being particularly designed as a rigid and/or tubular connection nozzle; - a second connection nozzle, particularly tubular, wherein a free end (12+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, particularly enclosed by a connection flange, said fluid pipe being particularly designed as a rigid and/or circular cylindrical pipe; - a third connection nozzle, particularly tubular and/or identical in design to the second connection nozzle, wherein a free end (13+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, said fluid pipe being particularly designed as a rigid and/or circular cylindrical pipe; - two tubular flow channels (10-I, 10-II), which are separated from one another and are each designed to conduct in-flowing and out-flowing fluid, wherein of said channels -- a first flow channel extends from a flow opening of the second connection nozzle, which is located in the free nozzle end (12+) of the second connection nozzle as far as a first flow opening of the first connection nozzle, which is located in the free nozzle end (11+) of the first connection nozzle -- and a second flow channel (10-II) extends from a flow opening of the third connection nozzle, which is located in the free nozzle end (13+) of the third connection nozzle as far as a second flow opening of the first connection nozzle, which is located in the free nozzle end of the first connection nozzle; - as well as an extension adjacent to an area of the free nozzle end (11+) of the first connection nozzle, situated between the first flow opening and the second flow opening, said area being particularly in the form of a plate and/or disk, wherein said extension extends from the free nozzle end (11+) of the first connection nozzle, with a length (l 14), up to a free extension end (14+) that is at a distance from said free nozzle end (11+). - a first connection nozzle, particularly tubular, wherein a free end (11+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, particularly enclosed by a connection flange, said fluid pipe being particularly designed as a rigid and/or tubular connection nozzle; - a second connection nozzle, particularly tubular, wherein a free end (12+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, particularly enclosed by a connection flange, said fluid pipe being particularly designed as a rigid and/or circular cylindrical pipe; - a third connection nozzle, particularly tubular and/or identical in design to the second connection nozzle, wherein a free end (13+) of said connection nozzle, particularly enclosed by a connection flange, is designed to be connected to a pipe end of a fluid pipe, said fluid pipe being particularly designed as a rigid and/or circular cylindrical pipe; - two tubular flow channels (10-I, 10-II), which are separated from one another and are each designed to conduct in-flowing and out-flowing fluid, wherein of said channels -- a first flow channel extends from a flow opening of the second connection nozzle, which is located in the free nozzle end (12+) of the second connection nozzle as far as a first flow opening of the first connection nozzle, which is located in the free nozzle end (11+) of the first connection nozzle -- and a second flow channel (10-II) extends from a flow opening of the third connection nozzle, which is located in the free nozzle end (13+) of the third connection nozzle as far as a second flow opening of the first connection nozzle, which is located in the free nozzle end of the first connection nozzle; -- a first flow channel extends from a flow opening of the second connection nozzle, which is located in the free nozzle end (12+) of the second connection nozzle as far as a first flow opening of the first connection nozzle, which is located in the free nozzle end (11+) of the first connection nozzle -- and a second flow channel (10-II) extends from a flow opening of the third connection nozzle, which is located in the free nozzle end (13+) of the third connection nozzle as far as a second flow opening of the first connection nozzle, which is located in the free nozzle end of the first connection nozzle; - as well as an extension adjacent to an area of the free nozzle end (11+) of the first connection nozzle, situated between the first flow opening and the second flow opening, said area being particularly in the form of a plate and/or disk, wherein said extension extends from the free nozzle end (11+) of the first connection nozzle, with a length (l 14), up to a free extension end (14+) that is at a distance from said free nozzle end (11+).