In my woodworking workshop I am using HT DN50 tubes to connect the vacuum cleaner with the different tools like e.g the table saw.
In order to steer the airflow I designed this valve consisting of the valve housing and a slider.
On the bottom side a DN50 tube can be glued into the valve housing. On the top side either a tube segment can be printed that fits in a HT connector (customizable) or alternatively a DN50 tube can also be glued directly into a opening in the valve housing.
I printed with support within the housing. The support can be stemmed out in slider direction. It might need a little force. The front of a flat file has just about the right size for this.
The slider should be a little smaIler than the slider opening. Set the delta according to the precision of the printer. If it still fits too tight: a little bit of filing helps.
The design is customizable, and might be altered for other tube sizes. However I printed it only for DN50.