Hiya Batty-lufc
If it is possible and the nozzle is made of plastic you could try and put a piece of 8-10mm pipe in between. You may be able to insert this in between the break and the rest of the nozzle. Pipe would be small bore plumbing used for oil heating but if not good palstic glue might be okay. Try very strong waterproof glue. Brands such as BOSTIK might be a good idea or EVOSTICK , if pipe is broken on outside and it is possible to put a jubilee clip round it, put a bit of hosepipe round it and clamp it good mate. Personally I don't use these things but the idea might work. Good luck mate.
Anthony Tovey
September 2010