Product review (3 stars): It worked, sort of, but with a caveat!
Our dryer vent just clogged, so I bought THREE of these kits as we have a ridiculously long run to the outside wall. The builder should be chastised...but, to the point. I'd connected only three of the rods and was advancing the brush using my drill, when - SNAP! That horrific sense that I'd just cost myself a LOT more than I was trying to save by doing the job myself. But, no, the break was within reach & I was able to retrieve the brush and other rods. I tried again, with the same result. I suspect that the brush hit an impacted plug and rather than going through it, just jammed tight and the rod took the hit. These are CHEAP rods, and not designed for that kind of torque (see photo). I ended up using a separately available vent adapter&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/POWERTEC-70136-4-Inch-to-2-1-2-Inch-Cone-Reducer/dp/B002DSDSY2/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">POWERTEC 70136 4-Inch to 2-1/2-Inch Cone Reducer</a>&nbsp;and hooked my shop vac exhaust to the INSIDE duct opening, and then went to the OUTSIDE and ran the brush back from there. I must have hit the same plug, but this time, the air pressure loosened it up and out it came. GLAD I ordered that adapter at the time I ordered the brush. So, this sort of worked, but w/o the air pressure, would certainly not have. I nearly purchased a different brand with a "cutter" head to get through such plugs when the brush won't go. Probably should have gotten that one. But, still, my severely clogged vent is now clear and I'm glad of that. But, unless you've got a short and/or straight run, the product being reviewed might not be the ticket. And for a severe clog, maybe not at all unless you're prepared to innovate a bit and still risk having a rod break where you might not be able to reach it at all. THAT could be expensive.