My original review ( see below ) was not kind to this product. After a few days tried again and much to my surprise the problem has solved itself, and everything is now as it should be. I have no idea what caused the problem, or how it was cleared. Originally I gave this product two stars but now I have upgraded it to four stars.
Quick delivery from supplier, but no invoice sent with item. Assembled onto cleaner quite easily. HOWEVER, once the metal extension pipe was fitted it could not be removed again to use upholstery head etc. Unlike the original hose release device this item has 2 buttons which need to be pressed to release the extension pipe. Despite everything tried, including using a clamp to depress the buttons together, I am unable to release the hose end from the metal pipe. Very disappointed because of this problem.