Connex makes a snap link for their 7 speed chains. It is not a Connex Link and it may not be reversible:
https://medien.connexchain.com/websi...5_englisch.pdf

Where do you do you see 6 speeds mentioned on their website?
https://www.connexchain.com/en/


Just for a little more clarity, 5 and 6 speed chains are one width, Ultra 6, 7 and Campy/Sachs 8 are another width, SRAM/Shimano 8 are narrower still, and then there's widths for 9, 10 and 11. There are multiple 12 speed chain widths.