Well I found that I enjoy the low res 18ohm heads moreso than the 2.4 or 2.8, so I ordered a 3 pack replacement (don't want to fiddle with rebuilding just yet). I received the heads, but they have this "giraffe neck" feature that wasn't in my original Vivi Nova. I don't know exactly how to explain it, but I'll try.
On my Vivi default head, the "top-most" piece is the plastic tube part that has a metal piece in there (the part you avoid while refilling). This is where the 'giraffe neck' is on my new piece. Rather than being a ~.25 inch plastic tube, it is a good inch or two tall, and sticks out of my tank completely. There is no screwing it off, there is no removing it, its just how its built. I can tell because its metal, and is directly connected to the bottom base of the head.
What in the world did I order?
On my Vivi default head, the "top-most" piece is the plastic tube part that has a metal piece in there (the part you avoid while refilling). This is where the 'giraffe neck' is on my new piece. Rather than being a ~.25 inch plastic tube, it is a good inch or two tall, and sticks out of my tank completely. There is no screwing it off, there is no removing it, its just how its built. I can tell because its metal, and is directly connected to the bottom base of the head.
What in the world did I order?