This is an adapter for the Festool Plunge Cut Track Saw (TS 55). It uses the innovative CAMLOCK connector by @PeterH, along with the jcjames_13009 version of the Festool end connector.
https://www.printables.com/model/624672-festool-domino-camlock-adaptor
https://www.printables.com/model/513981-camlock-adaptors-in-05-mm-increments
https://www.printables.com/model/556790-camlock-suction-end-nozzles-must-have-set
https://www.printables.com/model/531466-camlock-suction-end-nozzles-all-sizes-and-shapes
https://www.printables.com/model/528075-camlock-adapter-for-ridgid-hose-od-4350-mm
The author remixed this model.
Used the jcjames_13009's model of the Festool end connection combined with the Peter H's CAMLOCK on the other end.