Connector for Bleeding Nutt Brakes?

[xc1443]

Hi - I have a RadCity 5 Plus and it is at my local bike shop and they need to bleed the hydraulic brakes (Nutt) but they say the connectors are not standard size so they haven't been able to get it done. I talked to Rad Power customer service today and they weren't much help. The bike shop is very reputable and says they all size connectors but the one for this bike is smaller than any of their conenctors.

I searched this forum and found this link https://www.parktool.com/en-us/category/parts?query=BKM-1 that someone had posted and noted that #'s 10, 12, and 14 are what is needed for the Nutt brakes. Has anyone else used these with success or have any other suggestions.

Thanks.