Product review (5 stars): Use standard tools with your Dyson vacuum
I purchased this about 2 years ago to use with my Dyson DC-39 Animal canister vacuum.  One end of the adaptor fits the proprietary Dyson fittings on my Dyson, and the other end fits into the standard hoses and attachments found on most vacuum cleaners.  This allows me to use "standard" (non-Dyson brand) hoses and attachments.  I normally use it with an extra long hose and tools I have from a previous vacuum cleaner.  It works great, and has saved me from having to purchase the more expensive accessories from Dyson.