I built this attachment for my ash vac the other day. Best $3.00 I can remember spending. I've seen nicer ash vacs with this attachment but couldn't find it anywhere to buy. A trip to the local TruValue, a rubber plug, and 20 inches of half inch flex tubing and I have a great attachment that gets into the tight areas you can't get to to clean. My HarmanXXV has some hard areas to get to.