I understand this isn't an home repair issue, but this seemed like the most promising place to ask.
We just bought a new vacuum cleaner. It's an upright like our old one. To use it like a tank type we attached an extension hose to the built in hose and used attachments designed for the extension. The new vacuum has a different size hose. The vacuum repair shop tells me this brand is unique to this odd size, and the extension will not slip into the built in hose and since it's unique, no one carries hose stock in it's size. It turns out that the diameter of the fitting on the extension and the vacuum hose are identical. I am trying to think of a way to connect the extension to the vacuum hose without making ANY modification to the vacuum side. The nipples are required for the hose to work properly in the upright mode.
Picture here
Ideas ??