Ah haa. I seen now, is it designed to collect the dust not trapped by the filters before it enters the engine? Ok as far as the rebuild is going: new rear spring bushed, wiring labled, chassis painted, wheels painted, engine in, cab on, started breaks but require new parts due to nipps snapping. I have also realised that 3 out of 5 ports on my spliter valve have slightly larger union holes than on the pipes supplied with my brake pipe kit. They are the same size thread as used on early defenders and series 3 clutch's (pipe coming out of master cylindar). Unfortunately the pipe is slightly larger so that union is of no use. If you know the union size or where to get it from please contact me or reply to the thread. (by the way, how much oil is required in the air filter??)
Ollie