I don't know why this little turbo injector works so well but it works. If you look closely, you'll think the brushes are at least 1/8" to 1/4" shorter. However, it easily removes dirt and cat hair on my caravan's low-pile carpet. I think a lot of that has to do with how strong the vacuum is. I used an 8 amp shop vac. a motor that has a lot of suction power and really gets the turbo brushes turning. A less powerful vacuum cleaner may not be suitable. Another nice feature is that the device can be easily disassembled for cleaning if necessary. The only problem I had was with my Shop Vac wand. It's an older vacuum and it's inserted too far into the turbo injector, which gets the impellers to the point of binding. I don't think this is a universal issue as it matches perfectly with the other wand I have. Anyway, the easy fix was to wrap a few turns of duct tape around the end of the stick. --Problem Solved-- This is a well-made vacuum nozzle that meets specific cleaning needs.
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