A fluid junction device for managing a first fluid flowing from at least two sources and a second fluid from at least one source, the second fluid capable of a negative pressure flow and a positive pressure flow, the device comprising: a body having: a first port adapted for fluid communication with the first fluid from a first source, a second port adapted for fluid communication with the first fluid from a second fluid source, a third port for the discharge of the first fluid received from first and second ports, the body forming a junction between the first port and second port and third port, each of the first, second and third ports (102,104,106) having a central axis, the central axes in parallel orientation with each other, a diverter formed in the junction between the first port and the second port, the diverter defining a nozzle with a sidewall of the body which sidewall runs along a wall of the first port and a wall of the third port opposite the second port, the diverter being configured for diverting the flow of the first fluid from the first source from the first port to the third port, said diverter is sculpted by a channel formed on the surface of the diverter; wherein a section of side wall of the second port has an escape cutaway that provides a gradual descent from the second port to the third port, and so forms an escape for the second fluid in either a positive pressure flow or negative pressure flow through the second port; the diverter is integral with a side wall extending from a mouth of the first port, such that a surface of the side wall extending from the mouth and the surface of the diverter is continuous with smooth surfaces; the diverter has a surface exposed to water coming from the first port, such that the surface is arranged to divert the first fluid in the junction so that a first fluid plug is formed in the proximity of the first port adjacent the nozzle; and the escape cutaway is further configured to maintain a diameter of the second port so that the second fluid escapes from the third port to the second port. a body having: a first port adapted for fluid communication with the first fluid from a first source, a second port adapted for fluid communication with the first fluid from a second fluid source, a third port for the discharge of the first fluid received from first and second ports, a first port adapted for fluid communication with the first fluid from a first source, a second port adapted for fluid communication with the first fluid from a second fluid source, a third port for the discharge of the first fluid received from first and second ports, the body forming a junction between the first port and second port and third port, each of the first, second and third ports (102,104,106) having a central axis, the central axes in parallel orientation with each other, a diverter formed in the junction between the first port and the second port, the diverter defining a nozzle with a sidewall of the body which sidewall runs along a wall of the first port and a wall of the third port opposite the second port, the diverter being configured for diverting the flow of the first fluid from the first source from the first port to the third port, said diverter is sculpted by a channel formed on the surface of the diverter; wherein a section of side wall of the second port has an escape cutaway that provides a gradual descent from the second port to the third port, and so forms an escape for the second fluid in either a positive pressure flow or negative pressure flow through the second port; the diverter is integral with a side wall extending from a mouth of the first port, such that a surface of the side wall extending from the mouth and the surface of the diverter is continuous with smooth surfaces; the diverter has a surface exposed to water coming from the first port, such that the surface is arranged to divert the first fluid in the junction so that a first fluid plug is formed in the proximity of the first port adjacent the nozzle; and the escape cutaway is further configured to maintain a diameter of the second port so that the second fluid escapes from the third port to the second port.