How come you selling it Cristian?No worries, for upto 3 stories what I picked and built does the job. Look at the water lift capability not just the watts. Try and stick with a known brand as allot of the vacs being sold are Chinese junk with unknown capability that's just made up by the seller in my opinion. Get a vac that's also got at least a 50 litre drum as on most jobs you will fill it in no time.
I fitted a Numatic 51mm side entry onto the Hyundai pro using the original small outlet. This turns it into a cyclonic action, keeps all the **** away from the motor by spinning everything to the outside of the drum.
It also improves suction and allot less blockages, I only use the foam filter provided from Huyandai around the bottom of the motor housing. The vac has a metal float cut off for water, but to be honest I never sucked that much water up with it to ever activate it. The hose,poles and tool end are all 50mm for the best flow and I used only 5mtrs of vac hose to cut down on suction loss as the more hose you have the more suction drop off you will get.
You have to take into consideration the length of the poles and tool head as well regarding suction losses. The shorter the pull the more suction available. And yes, some of the companies selling gutter kits are taking the pee regarding prices!!
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