Does anyone know the size and thread type used on the top of 200tdi and 300tdi injectors. I know that the across flats size is 17mm, but the threads seem to be BSP of some sort. I am trying to make up a injector pressure tester and need to know the size to order the unions. I will be using a injector pipe off a 200tdi. Any information would be most welcolme. Regards Tom.