I have just bought a number of Danfoss thermostatic rad valves to fit to my existing 10mm system. I had expected that the valves would come with normal 10mm compression fittings that I could simply attach to the existing nut and olive on the end of the pipe at each Rad. But in fact the valves are normal 15mm fittings with the addition of a 10mm brass bush which fits onto the end of the pipe. My problem is that there is no obvious way of making a seal between the pipe and the bush - it obviously does not tighten on the pipe as the nut is tightened and there is equally obviously no room for the normal olive fitting. I'm sure that there is a perfectly obvious answer to this problem - anyone know what it is?