I had originally purchased this for my DEWALT D26451 Orbital Sander. I first was trying to figure out in what ways I could get it to fit so at first I was disappointed because the smallest end would not fit, but the larger end would fit, but then when the other end was hooked up to the hose it simply was too small to slide on the ShopVac, what I did find though was that on the small end, simply by cutting off a single tier to the adaptor that the next notch up fit my DeWalt with a slight bit of modification. I give it 4 stars because after I cut the small end off it does exactly what I need it to, I took away a star because I had to modify it, but other than that, this thing worked beautfully for what I needed it for... so If you have a DEWALT D26451, THIS WILL WORK, but you will need to cut the smallest tip off using a razor and trip up the inside of the cup and need to stretch it slightly and after that it just slips on like a glove. Since I purchased this exclusively for use with my D26451 modification was not a big deal and especially since the modification was a simple and easy 2-minute fix.