But since Dyson is wickedly greedy, these adapters are necessary. Lots of feedback on things they haven't worked on. I can say with confidence that they adapt hoses and nozzles from Dyson DC59 series cordless vacuums or the same vintage Dyson DC28 vacuums to v7 series cordless vacuums. They are made from the same quality material as Dyson; they fasten functionally and securely; and they even look so much like Dyson products that you might think they are actually Dyson OEMs.