cursed hose nuts -

If the hose/cleaner is new the nuts are often quite tight. Remember that they are threaded onto the hose. The narrow side of the nut goes onto the fitting/swivel/head, the hose is pushed on, and the nut screws onto the hose. I've seen ones done backwards and they are very difficult to remove if they are tightened enough to actually not blow apart. If they are installed correctly it just takes a lot of hard twisting at times.
 
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