x type power steering leak

hi i have a 04 2.0ltr diesel and it is leaking power steering fluid from the union where the pressure pipe leaves the pump , it leaks between the 18mm union and the pipe , the union is listed separately so has anyone replaced one of these ? or anyone know if the union will come off the pipe ? I i am using the car and do not want to strip it and find i have not got the bits to put it back together