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Does anyone know what the “connector piece” mentioned in this video at 6min 11s is called: https://www.youtube.com/watch?v=-HIOiyPKUbQ&t=6m10s

And where to buy it?

I could not find it Lowe’s, Home Depot, Alkaviva, or the place that sold the water filter unit.

I don’t mind buying the entire kit if I have to, but I just can’t find where I can buy it from.

Thank you and Happy Holidays 🙂

Update 1:
Sorry, but I should clarify that the Shark Bit quick connect did not work because the threaded end did not reach far enough in to the spout side.

I have a video too, but StackExchange won’t allow videos.

Update 2:
I tried to contact the manufacturer but there was a language barrier so not much information was exchanged. I also tried contacting the person who posted the video, but have not received a response.