You can join washing machine wastes together to make longer ones.
I'd give the manufacturer a bell first though to ask if the machine is OK with the length of waste you need.
provided it runs up at the back of the machine to the under side of the work top and then down hill it will empty on gravity just if you go too long you cant get enough falll on the flex get the waste connection as low as possiblei ive got away with five metres the important thing is to avoid dips
Steve its an awkward one, machines in cupboard next to downstairs toilet and customers wanting it into the waste at the sink in there. Kitchens too far away so rules that out.
If possible try to tee into sink waste low down & run a waste with trap & standpipe for WM.
You could add one extension hose onto the WM hose & it should probably be fine, but I would check with the WM manufacturer, as has been already mentioned, if the machine will be okay pumping out against the longer hose, so you don't get the blame later.
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