If you mean the hose that feeds the washer from a spigot then nearly all of those types of hoses are standard (at least here in the U.S.) and the usual garden hose will work. It may be that, for some reason, the seller removed the fitting from the pump. You should be able to buy the fitting cheaply at any DIY store or one that specializes inthis brand.
If you mean the hihh pressure hose to run from the pump output to the wand,then the same advice applies.
Best of luck!