Jay the window man
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That was my theory on it. Yes I use uni valves. Genius I must say. I didn’t see why I would need both but you have answered my question. The remote seemed to be very expensive and just not necessary when a £45 uni valve seems to do the trick. Very helpful information. Thank youQuite often people cleaning windows with a trolley are working from a limited water supply so being able to switch the flow off and on remotely saves water.
Do you use univalves? If you do then I would say a remote isn't as important. If you don't then a remote is handy as you can stop the flow between windows to save a little water. At the price they are charging I would spend the money on univalves as then you can save water on each pole.
If it's just for occasional use I would get a gardiner backpack and a Handy sac truck.
I believe the nano trolleys have a lithium ion battery - so light weight and easy to take the pack off to recharge.