Inflatable Raft Pump Reduction

I made lot of models with 3D printer during last 4 years.
Some of them were exposed on my stall at Maker Faire Prague 2021.
Now I would like to offer some of them for other 3D printing guys.

There is one small and cheap piece. It is Inflatable Raft Pump Reduction

 which is used for different pump type with higher performance.

It can be printed from PETG filament with layer 0,2mm