Some adaptors - round to round in various diameter

And again some parts i designed primary for my own use and now they are here.

During summer period i use mobile air conditioner and the hot air is going thru big tubes outside, but like so often, the tubes are not long enough and do have various diameters.

So here we are. Some of my Adaptors...

If you need different diameter and/or length, contact me via the comment field, thats the easiest way. If you need nippels for holding pls also tell me the position and diameter.

The Staubsaug